I don't think any posts at all should have an expiration date with an autolock.
I think that it could prove useful to perhaps automatically transfer old hofs (hofs/ubers/ath) to an archive after a certain amount of time though.
And as an addition, any time you want to post in an archived thread you'd have to confirm your post (like; "Dis be a oldie, ya rly wna post?") after hitting the submit button to prevent those random "lol, grats m8"-posts to a 3 y/o hof that's done w/o looking the poster even noticing the OP's date.
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