In SF4, I’d like to see a blend of SF2, 3, and Alpha. Ryu is a hidden boss, and plays a lot like his SF3 version except his normal Joudan behaves like his EX Joudan and he has a goddamn air fireball. It’s been twenty years, it’s about freaking time Ryu got an air fireball. Akuma would play a bit differently, with his normal attacks doing less damage (to represent his aging) but his fireballs and supers doing ridiculous damage and making the Shun Goku Satsu instant kill (but slower, to once again show his age). Chun-Li should be retired, but one of her students should be in the tourney so you ahve that same kind of jumping, eclectic style. Sakura and Sean would replace Ken and Ryu as starting Shoto characters, though they would each play a little differently. Yun and Yang should be in it, with Genei Jin, etc. and Fei Long should be in it as their objective in the tournament. Urien should be in it as well, and I think he should lose the Aegis Reflector (or be able to use it fewer times in a match) while getting a big speed boost. Remy should be in it, facing off against an aged Guile (who has re entered the tournament upon hearing rumors that M. Bison/Vega still lives). Q should be in it, as should Balrog, and at some point it should be revealed that they are the same person (though Balrog would play differently than Q, obviously). Dudley returns so that he can fight the American boxing champion (Q/Balrog). M. Bison/Vega makes a comeback, and I’m thinking he should be the uber boss of the game, and make Shin Bison from SFA3 look like a pansy.
Basically, a blend of SF2 and SF3, with a nod to SF Alpha. It should of course remain 2D, as I remain firm in the belief that, bar some exception (Rival Schools), the SF “style” does not translate to 3D, at all.
As to the SF2 v. SF3 cast, honestly, they’re both damn good. Elena’s fighting style just looks beyond awesome (even if she isn’t a terribly effective character), Hugo’s moves look painful, etc. The SF2 characters in SF3 make it, IMO, a better game, as you have characters that people are already familiar with, and maybe after they see what new tricks Ryu has they’ll give Oro or Alex or Yang a try. Heck, Akuma may be my best character in 3S, but I’m none too shabby with Urien either. I don’t think the SF3 cast is maybe as “classic” as the SF2 cast, but when you follow up a game that has absolutely mindblowing success worlwide it’s difficult to have lightning strike twice, if you catch my drift. For my money, I like Alex much better as a grappler character than Zangief.
To be completely honest, more SF3 characters need to be in Capcom games. They won’t ever get as popular as the SF2 cast (who’s in a dozen games besides just the SF2 series) if they stay a part of the SF3 series. CFE doesn’t fucking count, because they destroyed Chun, Yun, and Urien in that game…