Lucas is a tinkerer and experimenter. He takes risks and is always looking to innovate even at the expense of entertaining people. The thing with experiments is this, some times they succeed, maybe even be huge successes, other times they fail, maybe even be huge failures. So yes Lucas is responsible for Howard the Duck and Jar Jar and some irrelevant movies like Red Tails and Willow and then you have your American Graffiti, Indiana Jones and of course Star Wars.
He isn't going to like the new Star Wars movie. It's a reboot that takes zero risks and doesn't experiment or innovate. There is nothing new to see there.
Something to keep in mind though, Disney is a publicly traded company. They have a legal obligation to make their share holders money, not do movie experiments. Disney may have way underpaid for Lucas Film but there was a huge concern Star Wars was done, pushed out by Marvel. Disney had a legal obligation to make good on that $4 billion of stock holders money they spent.
With that in mind TFA was an excellent and intelligent movie. The reality is SW is almost 40 years old now. Some of the actors in that movie are already diseased. Sadly in the next decade, even more will be. Young people, where all the money is to be made, are not going to be infatuated with a movie full of a bunch of dead people. Just is not going to happen. It's the movie grandpa likes. They had only one option, take the original Star Wars movie, update it and hand that story over to the new generation of little tikes so they can be infatuated with their own movie, not grandpa's. They did exactly that and they did it more than well enough. This isn't a movie for dad or grandpa although they would like it well enough too.
The next movies and stand alone movies Disney will have a little wiggle room to innovate. However that legal obligation to the share holders will not change and the movies will be safe, good but not great, and money makers. After they double their investment and know they can't produce similar stuff again and again we will get the equivalent to Guardians of the Galaxy in the Star Wars universe. So yes, we will eventually see something rather different but not until Disney has made good on that $4 billion.
Star Wars was a transformative movie. It fundamentally changed culture and an industry. We should have no expectations or hope that such a movie will ever again be produced. We will see other transformative products on the market again though, the last big one was the iPhone, but don't expect anything of that scale to come out of hollywood ever again. It is a fully mature industry. It will innovate and evolve slowly over time but its days of completely shaking and transforming human culture are over even if it is a huge part of our culture. The same can be said about the music industry.