It is simple. This overrated assclown made three lousy Star Wars prequels. Disney comes along, hands the reigns to a young talented director and already has made back a big chunk of its investment. Insult to injury, they didn’t want Lucas involved. They kicked his arse out of anything to do with the new movie and even outright rejected his ideas. Lucas’ ego just got a blow from which he is discovering no amount of money will help.
Well he and Spielberg can always do another Indiana Jones film. Maybe J.J. Abrams can reboot that series as well.
The thing is who can or will be the new Indiana Jones??