Bingowings said:
I really can't see why George thinks the story has ended now, surely there is at least three films to be made about the perils of re-building the Rebublic and not becoming the Empire in the process?

It might make an interesting TV show, but I don't see the movies touching this terrain. According to Lucas's thinking (as I understand it), the story arc was about Luke Skywalker and his adventures. By the end of ROTJ, he has come from being a whiny farmboy to a being a Jedi. Lucas reinvented things by saying the new saga including the prequels was now the story of the redemption of Anakin Skywalker. Whether this new reimagining is plausible or not, it doesn't leave room for a sequel trilogy. The movies would have to be massively remade to match Lucas's original 9 or 12 movie story arc for there to be any room for the sequels.