Even George knew how bad Jar Jar ended up being. Like his instructions for the writers in Clone Wars episodes involving Jar Jar were "The characters are about as annoyed with him as the fans are" and he had a life-sized "Jar Jar in Carbonite" commissioned for his office.
And while George got really overdramatic about Disney throwing his treatments out, most of his ideas are still in play. In fact, Rogue One is the only current Star Wars film project that wasn't one of the ideas George gave to Disney. The Han movie, the rumored Boba movie, the basic setup of the sequel trilogy being focused around a young woman's journey to become a Jedi in the midst of the New Republic's fall, all from George.