It's certainly an issue we've thought about. For threads with wiki sections, any user can go and start building one already if they want to. I had been maintaining the Major Updates section in the wiki for the
DarKoaster thread, but I haven't added to it in a bit. If there's something anyone out there thinks should be added, by all means, go right ahead! Hopefully the effort renders that thread far more useful for folks who stumble upon it long into the future.
It's my intention to continue to wiki-ify all major project threads moving forward, but going through and manually indexing older threads after the fact sounds like a really daunting task. In my case, I'd rather put that effort into building out/updating more wiki pages for park attractions, events, etc.
That said, if someone else has a particular interest in building out an index of some of the older project mega-threads, I'm happy to wiki-ify spesific, older project threads so people have a place to do so.
This applies to any thread really. If someone is feeling particularly inspired to write an index of a big thread or wiki page for an attraction that doesn't have one yet, just let us know and we can get whatever thread you're interested in wiki-ified.