yotsuya said:
But, he sold it outright and put Kennedy in charge so he clearly didn’t want any part of the development process. So it really is his own fault.
That is not true. Iger’s book makes it clear, that Lucas wanted to keep creative control after the sale, but Disney would not give it to him for understandable reasons. The fact that Disney chose to buy his treatments gave him some peace of mind, as he clearly believed, that at least the saga would be continued on the basis of his ideas, but when that didn’t happen, he was obviously very disappointed to the point, that he initially didn’t want to come to the premiere of TFA, and only showed up after Bob Iger convinced him to do so.