It's obvious that the deletions are getting out-of-hand, and we're losing good answers at a fast rate. How about making a new button
lock after a post has been closed, and three or five votes can lock it, thereby protecting it from deletion?
I'd think 3k should be enough to do this, but I'm flexible on the parameters.
EDIT: With this solution now implemented, there probably isn't a huge need for this. I'll leave it up for those who think there is that need.