I've been thinking the same thing -- that Hermione would want to finish her studies, Ron would go directly to help George out (although JK has said he eventually becomes an Auror, if I recall correctly; still, independent study is always an option there), Harry'd be where Ginny wanted to be, and Ginny, who apparently is set to become Chaser or Seeker for the Harpies, would probably return just to shake the cobwebs off her broomstick.
And it's such a good story to tell, that if I were you, I'd just throw an AU on it if they had a problem with it complying.

) might be witty, sarcastic, or a million other things, but the dominating feature is our love for knowledge. 