For my bad idea of the week I give you this.
Either individual pages for each, or a mashup, but a random page. You click the photos one and it's a collection of various photos going back to the beginning. Either have it refresh with each page load, or maybe daily.
It would be a cool way to discover old news, pictures, videos that one might not have seen.
Threads can come back at any point but everything else get's buried for good. I mean that's not necessarily specific to this site but there's been a lot of good content for years, especially the photo and video sections.
Would be cool if there was a good way to dig through it.