Before DLC was officially announced, this speculation group died down a bit. I'd imagine once we are through the major part of DLC (and Sakurai says, "No more DLC") then I feel some of us will move on. It's inevitable, as Smash speculation is the strongest bound between all of us.
Personally, I'll probably keep looking for information/ translating old articles. I might just go through and translate the 64/Melee site, and Sakurai's Famitsu articles

. There's a lot of things to find out still, as evident by my/ others numerous discoveries over the the last six months. However, I might start investigating other Nintendo series eventually to see what other information may be hidden. I think Smash was pretty special though because it's such a huge series and the number of Japanese speakers who really care about development/ speculation is somewhat limited. Especially when compared to other Nintendo series like Zelda and Mario.