I agree on the highly doubtful part, but the only hope that I potentially see for them being made, is that Lucas fails so miserably in all of his upcoming future projects, that he starts missing the fame and fortune and therefore has to turn back to old reliable, once again - the Saga.
But like I said, doubtful.
Not gonna happen. Think about it - technically, the guy has a hand in just about every major hollywood blockbuster. ILM and Skywalker Sound have worked on so many movies over the years, he'll never be out of the spotlight, and neverbe out of a job. And he'll never
need money.
The only way it'll happen is if he decides to give control to someone else, or maybe after he's passed away and someone decides to buy the rights from one of his kids or something. Then you might see more adventures. But by then, will anyone really care?