You guys are all about reading the introduction and other posts and stuff. I don't see why you can't just try to start making a habit of checking the date on top of the post
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It's one of the first things displayed when a thread is opened.
I agree with
@casportpony, I don't think the old threads should be locked.
It is funny to see them pop up again sometimes. I think I saw Drumstick diva's introduction thread pop up a while back, that was pretty interesting.
Goodluck with your zombie problem greeters. I think it could be worked around without any modifications to the forums needed. Just start checking dates so you get into the habit of doing so.