CatBus said:

I only have one question I'd want answered by a sequel trilogy:

Why was the sequel trilogy made?

George Lucas said:

'Well, I’ve got to build this company up so it functions without me, and we need to do something to make it attractive.’ So I said, ‘Well, let’s just do these movies.’

CatBus said:

I'm not saying it can't be done, but one of the best things about ROTJ was that it ended the story. Not necessarily well, or entirely satisfactorily, but it ended the story nonetheless. It will be hard to write past that ending.

Twenty two years worth of novels would disagree with you. =P Sure they blew up the Empire's big super weapon and killed the Emperor but there's still a fleet out there that's big enough to police a galaxy. Not to mention Luke's continuing journey toward becoming a Jedi master and his obligation to "pass on what you have learned."

There's still plenty of potential in that far, far away galaxy.