I'd think a lot of the features that exist in SMF 2.X are achievable, the code is technically all out there and provided by the SMF developers/community, but it can't just be upgraded in a traditional sense... it sort of needs to have features ported over into Bitcointalk's version of SMF, which nobody really has access to outside of theymos (to my knowledge), so I'm not sure how complicated that ends up looking, but I'd guess it could be done in less time then it has taken epochtalk to get to a full transition state for this forum (no offense).

I've always preferred this forum and generally dreaded moving to a new platform entirely, but this version of SMF does need some help from an aesthetics point of view, needs to be mobile-friendly/responsive, an API would be great, maybe some minor theme options, and drag/drop images would be nice.. although I may be asking for a bit much on that last one. Maybe if talkimg had an API that bitcointalk could communicate with, a drag/drop image could be redirected to an upload on talkimg which then returns the bbcode for it.