Well, John Ridley wrote the script and had Lucas' approval for it. I just really think George was tired of the whole thing and wanted to retire from it all. Perhaps red Tails came a decade too late in Lucas' career? Maybe he would have brought something more relevant to the screen then or back when he was first working on it 20 years ago? But visually and sound-wise the film is first-rate. But George has clearly rediscovered his passion and energy regarding his innovative art museum proposal.