Bluntly: Best thing that could happen, especially if you're a Star Wars fan. George Lucas is the most influential filmmaker of the last half century and we all owe him a debt in terms of how he's advanced the technical aspects of cinema. But the dude can't write or direct his way out of a paper bag. Equally bluntly: The best parts of the Star Wars extended universe are the parts where he's not writing or directing.
John Scalzi has some great insights into Disney's purchase of Star Wars