There is only one reason why the sequel trilogy will/should be made:

MONEY!

There is absolutely no artistic merit in extending the movie series beyond Jedi. It's a natural ending to the storyline, whether it's the OT or the 6 episode saga. I don't see loads of people wanting a ST and although most people here knock it, a ST would overwrite the last 20 years of EU storyline's, alienating the fans of the early EU novels.

But hay, everyone has a mortgage to pay so anything could happen when money is the driving force behind the decision.