Simple: Lucas doesn't sell the franchise upon hearing this and torches any hopes of anyone buying the rights from him. Man loves money, but what little artistic integrity he has will tell him 'no'.
reboots generally change the story of the original somewhat, in order to make it seem different enough for moviegoers to bother with. What changes might be done to the original SW script? It was a pretty straightforward story of good guys vs. bad guys... in spaaaaace! Sure, better CGI could make the battles and aliens immensely better looking on the screen, but what would people want to change in the story?