I've noticed quite a few of the threads I'm on are reanimated zombie threads. I've one that popped up from 2012. I've particularly noticed them being reanimated by spammers.
On other sites you very often see a message at the bottom saying 'this thread is closed to new posts'.
Is it something you would consider MNHQ? I suppose one reason not to is that the op might come back to update at a later time, so perhaps a solution is that the only person who can reanimate after say, 12 months, is the op.
What do you think?