First off: Expecting Capcom to do ANY anniversary collection correctly or comprehensively is an exercise in futlity. The Mega Man collections are the exception, but their previous retro series, Capcom Generations, was maddeningly incomplete.
Gotta say, honestly I found Alpha 2 to be the pinnacle of the Alpha series. 3 had far too many characters, bland music and gameplay and seemed to be nothing more or less than the definitive revisions of Super SF 2 Turbo. Fine if all you wanted was more SF, not so good if you wanted things to go forward (which was what SF3 tried to do) But that's just my opinion.
I think there might be some milage in doing a re-mastered SF1 . . .after all, the backwards-looking Alpha reinvigorated the SF franchise after it collapsed under the weight of its 9th revision and became the basis for most of their post 1995 fighter output.
I don't know that it's possible or likely, as Capcom's all but rolled over and given up on SF and everything else lately. But hey, dreaming costs nothing.
"Nothing lasts forever, so why not destroy it now?"