I've been thinking if the following theory might hold some truth:
Perhaps after being approached by several large studios interested in joint ventures or complete acquisitions, or simply because he was fed up of Star Wars, George Lucas got motivated into making the prequels and TCWS only to increase the stock value of his own companies, before selling them at the right price.
Now, for the prequels, it may be pushing it, but let's not pretend that Disney's decision to acquire Lucasfilm was taken yesterday. If Lucas was truly motivated by telling a meaningful story, even through TCWS, he would not relinquish all creative control to be reduced to a mere creative consultant of his own universe.
Mind you, I'm not worried about pushing this theory that far as to claim that even the prequels were part of his financial sellout plan.
I never took him seriously when he pretended he couldn't make the prequels until now because of major technological limitations: if anyone remembers movies like Blade Runner, Dune, Return to the Future and Total Recall, you'd know he was just talking BS. Especially when it came from the same guy who made the movie industry advance so much, who pioneered many techniques and had his studio produce one of the best space battles ever, if not the only one to surpass them all.
The prequels would have been less of an orgy of visual special effects, contrary to that mount of CGI shoved in your face. Everything that is present in the prequels could have already been made, especially shots of Coruscant. Even dynamic shots dammit. How the fuck can he pretend he couldn't render Coruscant when he has already shot two movies which had major engagements, some even at high speed, happening both in orbit and close to the surface of
moon sized supercities floating in space??
Or how shooting large clone legions could be a problem?
He already made Empire Strikes Back, which had plenty of explosions, saturated with lasers and even a sort of nuclear explosion complete with flash, a sequence so good that people still laud it as one of the most beautiful sequences ever
decades later.
The movie Spartacus (1960) with Kirk Douglas already had lines of soldiers shot from a distance and the studio didn't go bankrupt on this.
http://www.youtube.com/watch?v=zgywD3XJaWU
Futuristic (weird) battle? Dune (1984):
http://www.youtube.com/watch?v=JUP2vEKsdn8#t=2h00m42s
Lava world? Star Trek, Search for Spock (1984):
http://www.youtube.com/watch?v=XS4s3XXNLiE
And of course matte paintings, plenty of them.
Lucas already had everything he needed for his "vision" back in the 80s.
Everything.
People often objected to Lucas' new works and pointed out that he had lost the spark. That he was just going down the lazy route, where the movies and books were purely produced for the money and nothing else.
Perhaps we simply never considered how
close to a truism this idea was. :)