I didn't really fancy the epiloque either...I acually thought she'd do something like tell a little about their future and not only about these characters.
But to the question...I'd hate it if JKR or somebody else would make another generation of Harry Potter. I mean Voldemorts dead and I doubt you'd feel enough hate f shed just come up with another evil person (or monster). Anyway...I can't imagine people would see it as Harry Potter stuff anymore, since there wouldn't be the same characters and probably not Harry Potter who would have any adventures.
Just can't imagine it...I really think it'sbest for the books, that you can imagine the furthur future of them by yourselves!