I have gone on record multiple times as saying that if contrived resurrections cheapen deaths, the answer is to stop killing off characters so frequently and not to have fewer resurrections. Killing off a character in a shared universe is generally an act of colossal arrogance and short-sightedness, a statement along the lines of, “Well, I can’t think of anything more to do with this character, and I’m the Most Creative Person of All Time! The only interesting thing left to do is kill them off.” It’s never true. There are always more interesting stories to be told with a living character than a dead one, and that’s what makes resurrections so inevitable no matter how contrived they wind up being. The blame should be placed squarely on the shoulders of the killing writer, not the resurrecting one.
I think death is kind of overrated as a narrative device. It's kind of cheap, really, an easy way of amping up the stakes -- just kill someone off, to show that everything is real, that we're playing for keeps. I find that a lot of deaths in stories feel like they're there more for narrative effect than for any other reason, and a lot of them end up ringing false when it's obvious they're supposed to be incredibly shocking.
Good examples of this can be found all over the place: A Song of Ice and Fire, for instance. (Game of Thrones, for you who know it by the teevee.) George RR Martin gets heaped with praise all the time for being willing to sacrifice main characters, but I'd posit that by the point we've now reached, it's clear that he's not sacrificing main characters at all; he's just disposing of secondary characters at surprising junctures.
More oddly, though, is the odd notion that a character should develop only so much, and then they should die. This strikes me as deeply silly, and the two best examples I know are characters who didn't die: Han Solo, and Martin Riggs (of the Lethal Weapon movies). Harrison Ford has gone on record in the past as believing that Han should have died in Return of the Jedi, because he'd reached the end of his narrative and because it would have given the story a lot more gravitas. And Lethal Weapon writer Shane Black apparently left the series after his intention to kill off Martin Riggs at the end of Lethal Weapon 2 -- pretty much for the same reasons -- was shot down by the producers.
The problem here is, our lives don't end when we reach handy points in our development as human beings. Well, for some of us they do, but that's just the accident of timing, not some existential thing about the Universe dispensing with us upon our reaching of our inner Zen. It's a silly reason to kill off a character, and Seavey is one hundred percent correct: a character doesn't run out of potential stories just because one particular writer does.
And besides, "Death as route to gravitas" is...well, it's just plain overrated anyway. How many major, named characters among the protagonists die over the course of The Lord of the Rings? Two: Boromir and Theoden. That's it. And yet nowhere in that entire story would I ever claim that the stakes don't feel pretty damned high, nor that a price will have to be paid for victory.
(For the record: Yes, I do think that Joss Whedon overdoes death as well, but his deaths tend to be a lot more visceral, given his skills at getting me to care about his characters in the first place.)
(W)hen you go back and read the original Green Goblin stories, he wasn’t much of a villain. He was a C-list Kingpin wannabe who failed at everything he tried, lost pretty much every fight he was in, and whose only talent was in running away. He didn’t even really have a backstory, because Stan Lee and Steve Ditko couldn’t decide who he was going to be under the mask. (Ditko wanted it to be a totally unmemorable nobody, to show that villains didn’t always have to be someone important to the hero. Lee felt like they’d spent so long building up the mystery of the Goblin’s identity that the audience would be upset if it wasn’t someone they recognized. The dispute was one of the reasons that Ditko left the title.) Basically, the Green Goblin was by no means the most important of Spider-Man’s bad guys.
Now, I'm not sure about this, and a couple commenters in the thread over there take issue with Seavey's description of Ditko's views and departure from the series. But Ditko's point here, even if it wasn't really Ditko's point, is a good one, an interesting one.
There was a very effective episode of Magnum, PI that did this to really extraordinary effect -- so much so that it's one of my favorite episodes of that series. Magnum receives a strange telephone call from a cackling guy who promises to kill and leaves Magnum bits of nursery rhymes as clues. This pattern repeats several times, and it becomes very clear that this killer knows Magnum well and has a very specific beef with him. It's a very well-made episode -- Magnum occasionally eschewed its Rockford Files-esque tone for a kind of "Hawaii Noir" mode, usually to very good effect -- but what makes it stand out is the resolution. Eventually the killer stands before Magnum, unmasked and grinning and waiting for his sick payoff...and Magnum doesn't recognize him. Even later, after the killer has been dealt with and the whole mess is over, Magnum doesn't remember him at all. He has to go back into his own personal records to figure out who this guy is, and it turns out that Magnum investigate the guy's wife some years back in a possible divorce case, but the case turned up nothing at all and Magnum didn't even take the guy's money. I don't recall what caused the guy to spiral into insane killing, and there's a good chance that the episode doesn't even fill in that detail, leaving it a complete mystery. But that's one of the things that makes it really memorable: that the villain isn't some significant figure from Thomas Magnum's past; it's just some guy with whom he had a completely mundane association for a short time years before, so mundane that he doesn't even remember him.
Of course, I can turn this back to Star Wars. One thing that really incensed fans as the Prequel Trilogy unfolded was the idea that at the very heart of the mystery that is Darth Vader is a pathetic teenager, a guy who couldn't get over the loss of his schoolboy crush.
It's a hard thing, explaining villainy. Sometimes no explanation whatsoever is the most disturbing way to go.