I sympathize with Lucas, but on the other hand, if you can't stand the heat, stay out of the kitchen.
Look, if you're gonna go mucking about with works that are cherished the world over to suit your own flights of fancy, you've got to expect to catch a bit of crap for it. If you're not up for that, hey, stay home.
Personally, at this point, it's less the constant tinkering that bothers me and more the constant tinkering while ALSO refusing to release "archival" versions alongside the new releases. Go ahead and tinker all you like, like an old man forever adjusting this or that in his house. But what Lucas seems to fail to recognize is that art is not solely HIS property. It's also the property of the public.
U.S. Copyright law actually reflects this, in theory, given that works can eventually enter the Public Domain and the rights to those works are no longer the exclusive rights of the author.
At any rate, given what I've taken away from his recent work, I won't personally be shedding a tear that there won't be any more George Lucas helmed Star Wars products, although I guess I can sort of sympathize with the fans who desperately want more SW product. I mean, if he changes his mind and goes ahead with other stuff, bully for him. I'd probably skip 'em anyway at this point, though.
That said, don't go blaming fan criticism for Lucas' own decision that he doesn't want to make the films any more. That's HIS decision and HIS alone. Nobody "made" him stop making film. He has now CHOSEN to do that. I mean, in all honesty, how many here would stop making props merely because idiots on the internet criticized the quality of your work? Now, how many of you would stop making them if you were also raking in boatloads of cash for your work?
I'm gonna guess you'd say "Pfft. Who cares what those jagoffs think? I'm makin' bank, yo." Or something to that effect. It's a choice. YOUR choice. Or rather, Lucas' choice in this case.