He doesn't need the cash. Disney did it for the cash though, they know a good IP when they see one and if it's handled correctly this could be worth a fuck of a lot more then 4 billion$. Still, that's what businesses do, I do not expect these movies to be made for charity. However finding people passionate about the world who want to make great movies shouldn't be that hard to do.
My favorite thing Lucas has done in years was this here: