I've noticed a large amount of zombie threads lately, one recently was from 2009.
Couldn't there be a way of making them harder to bump?
I don't know, something like the OP's post in red with Zombie stamped over it?
Having to enter your password if you want to respond to a thread that is over six months old?
Archiving threads of a certain vintage so that they can be read but not opened again?
Please?