I hate to admit it, but whatever happens, MD, LA and SF are all goners. Maybe Platinum and RR, but that would be a shame. I'd hate an HG/SS-onwards format, it'd narrow down options way too much, and if you're not running a Prime, you're dead. It'd be all Gengar Prime from there onwards. I must admit though, I'm kind of relieved that it's the end for Uxie X, Gyarados and Gengar SF. I never got any of them, and they've been a pain to play against. As for Luxchomp and the SP-engine, I think they've got a bit more life left in them (hopefully).