Hell yes, they have. Not that DC is much better with their trend of, “Huh, sales are down slightly. Time to ASPLODE TEH UNIBERS!!!” I mean, seriously, how many times has the entire universe/multiverse been destroyed in DC now? Three?
And let’s not get into the obnoxious ongoing, “Aunt May is dying” storyline which keeps coming up. I don’t mind if they want to roughly keep Spider-Man static. However, the character has aged a few years. Let him be an adult. Adults have to deal with things that younger, more innocent people usually don’t. If Aunt May gets sick or hurt, she may die. This can be done and have real meaning. What you can’t do is say, “Oh, she’s gonna die! Nope, she’s not! yes she is! No she’s not!”
It’s the same crap they keep doing with bringing back dead characters, but even more teasing. Death in comics is really cheap and frankly, not that interesting. Consider: the very first reply was wondering how long it would be until they simply rebooted the comic or something. If you’re not willing to stick with a character death, don’t do it in the first place, because you just cheapen the impact. I don’t know anyone who cares at all when a comic book character dies anymore, because they know it’s either a minor character nobody bothers with, or the character will be back shortly.
There’s also no real reason for it. I want to see the hero live to defeat the villain, not kill the villain. I’m perfectly happy for the villain to get blowed up in a terribly base-demolishing explosion that NO ONE COULD SURVIVE! Because after all, we know that means the villain can back for another great story. if the thematic arc of a story demands the villains’ death, then fine - then you can’t bring him back. That hurts the old story, and you probably don’t have anything really good to do with the villain anyway. Is the Green Goblin now really worth the retroactive damage done to the entire Spider-Man line by bringing him back?
And hey, let’s say you do have a really, really good reason to bring the villain back. Let’s say there’s some impressive story you want to tell. Make the villain’s return be a significant event itself. The villain absolutely should not just show up one day and then make some vague excuse for why they were on vacation. Have the villain actually be brought back. You’ve got mystics, pyschics, super-technology, and random deities wandering around. It’s not impossible for dead people to get back. But it also be an important event. Who will try to make it happen, and why? Is this part of another evil plot, and what comes of it? Will other heroes be involved?
Were I in charge of a major comic company, I’d establish the Death Rule: it’s fine for some characters to survive apparent deaths as long as it’s been specifically get up and telegraphed. But otherwise, you get one chance every two real-time years to try and bring back a villain, and you’ll have to compete with every other writer wanting to bring theirs back. Best story concept wins.
And here is perhaps the fundamental issue in comics today. Editors simply don’t do their job: they want somebody else’s job. Editors in comics don’t edit. They want to write. They try to dictate plots and arcs and demand that writers do certain things. This is not their job, and it is not helping. The job of the editor is to reign-in and correct writers when they go astray or make mistakes. But instead of doing that, they’re actively pushing the worst excesses of the art.