The thing is, that doesn't solve the problem. It's about effectively using the forum and it's resources for the benefit of everyone. The post in question doesn't help anyone. It just bumps a long dead thread to the front page. It may or may not even help the poster. A more effective approach would be to post in a brand new thread, in the appropriate section. In this case, the WTB section.
Again, this is not intended as a personal attack towards anyone, nor should it be construed as such. It's simply about what should proper forum etiquette be in order to maintain this place as useful for everyone. Otherwise what's the point?
An example of a forum that does let threads expire as you seem to be suggesting is the official Apple support forums and what I see there often is a totally relevant issue with a Mac or iPhone that I'm looking for to solve my problem and I find one, but I cannot ask a question because 2 weeks after the "solution" is posted (which may not quite solve my issue, but the people there probably know the answer) they close the thread to new posts and say create another one.
The problem is the people that know all about it are in that thread and might get informed of a question there if it were active and they might be able to solve my little quirk easily, but since it's closed and they aren't looking for the problem anymore, the odds of them showing up in the "new" thread and answering are almost non-existent. Instead, you'll get a bunch of people with the same problem that also don't know what to do and then you eventually end up with a half dozen threads on the same stupid bug, none of which address the little quirk you want to ask about. This happens a lot there and it's frustrating as all heck. People aren't looking at the
front page. They're searching for what they're looking for and finding 10 useless threads (because they cannot respond to any of them) on the same topic. What a mess.
So my question here to your idea is what exactly is the difference from your perspective between a pointless revival of a
necro thread and a
new thread that has a similar heading that you'll
also find useless or annoying? It seems to me that It's the same thing. You'll see something that you'll ultimately ignore anyway and it wasted your time because it doesn't interest you. Meanwhile,
legit "necro" posts where something is still relevant have these banshee death "warnings" on them that are absolutely
ridiculous sounding the way it's written (but at least it addresses the problem without creating a new one) and 20 threads about the same flipping topic because you want them to "expire" like other forums, all because certain people can't be bothered to either hit unsubscribe and ignore old threads that occasionally get (once in 5 years here in that example) a new post?
Worse yet, here you have specific creators of props and what not and people want to ask about that specific one, not just any one, but if the thread is closed, I guess it's either PM time, which might just be more annoying for the original person than a question in a thread they're able to unsubscribe from and can then ignore if they so choose (PMs can't be ignored; maybe specific people, but new people can do the same thing) or again, we get a bunch of new threads on the same topic.
I don't go looking for new threads all the time on here. My interests are limited to certain movies or collecting items. I'd prefer if people interested in things from the Maltese Falcon, for example all posted in the same thread on Maltese Falcon props so I'm notified of new posts/questions/activity regarding that movie and its props. Instead, even with the Necro warning, I'll find a half dozen or more threads on the Maltese Falcon dating back 20 years show up in the search. Some might have relevant information to a newbie, but having to track down 20 threads that then doesn't inform someone like me that was following the one I was participating in about posts, I end up missing something that might be interesting to me if I don't constantly check for new posts and/or searches on the topic just in case someone creates a new Maltese Falcon thread. And if it expires, I would HAVE to do just that since a lack of activity in an old one (as people are doing other things) would make it expire. That sounds like a much bigger hassle to me than ignoring a new post on something I'm not currently interested in.