In the paper modeler's topic area someone asked a question specifically about materials that work best (Advice needed). Well he got a lot of very good answers (particularly from me

There are some "info" threads in some other areas that have some permanence which is nice (how does that work?), There are unique questions that appear outside of general construction that would be nice to remain up, like the perennial "what color is the Enterprise" question that seems to come up every couple of years or so. It seems a shame that some topics that remain active for a couple of years vanish because 30-60 days went by without a "bump".
Paper models also has the unique aspect that models are available through links, but unfortunately if no one bumps the thread after a while models, sometimes lots of models, vanish into the ether. If one wanted to limit it to a couple of threads for dowloadable kits (40K for example) that would help. Sure, the links go dead, but some actually end up in the archive(.org) and are actually still out there in a sense IF one has the original URL.