What follows is based on what we see from our public perspective. I understand there is much more to the man than we know...
That said, I truly feel sorry for GL, as he appears to be a sad an pathetic man, with the emotional maturity of an adolescent.
He has compared viewing TFA to attending an ex's subsequent wedding to another. As a GROWN-UP, you don't attend your ex's wedding if your sole intent is to p*ss on the bride and groom. The more mature and emotionally sophisticated route is to keep your feelings to yourself, or simply don't attend.
At nearly every significant turn, or milestone, in GL's post-1983 SW history, he has fumbled, contradicted himself (if not knowingly lied), demonstrated virtually universally agreed-upon poor creative choices, and become repugnant in the face of criticism.
--Constant and poorly executed revisions of the SW OT
--A documented (filmed) statement declaring he is actively against modifying a work once it has been released for public consumption, followed by his ravaging of the OT
--Critically panned series of prequel films that appeared to demonstrate his unbridled hubris and refusal to acknowledge input from other respected sources
--And the list goes on...
But in my mind, the most significant failure on his part is to maturely and professionally accept valid criticism for the PT, and the OT revisions. Both in the court of public opinion, as well as in the reviews of professional film critics, these filmmaking ventures were essentially deemed as failures - not financially, but creatively. Perhaps not utter failures, or perhaps "failure" is not the best word, but all readers here know what I mean.
However, rather than publicly accept the fact that perhaps he misstepped, (that perhaps his creative choices are not necessarily "up to snuff" and/or perhaps he should have factored more input from others), his basic response was, "Eff you all - I made the movies I want and I think they're fine. But when all your audience can do is rip you apart for it, it's no fun anymore and I'm gonna take my filmmaking toys and go home."
And he quit...
He basically got pissed off, picked up his toys, and left the sand box.
Thankfully for us, he sold his toys to someone else - for Four Billion Dollars. Now that "someone else" is playing - quite well, I might add - in that sand box.
And GL is sitting off to the side, butt on the playground asphalt, knees brought up to his chest wrapped up by his arms, glowering and fuming as he watches someone else play with his toys.
Again, I feel sorry for the man, as I fear his personality and psychological issues may well lead him to a state of misery, possibly on to his death bed.
Rather than reflect with warmth and positivism on what we all appreciate about him (the creation and delivery of the SW and IJ stories), and rather than embrace the fact that he made some missteps (we all make mistakes - when you're as large as GL, your mistakes will be large too) and reach a degree of peace with himself over it, and rather than fully accept that fact that he has indeed handed off the SW franchise (for better or for worse in his purview), he has elected to remain indignant and to demonstrate a notable absence of respect, professionalism, and emotional maturity.
Basically, he has elected to stay pissed off, and allow himself to wallow in a degree of misery...
Again, this is MY interpretation based on what is has been published, and publicly discussed. I hope I'm not all together right on these issues.