PARC has an incredible legacy, but the problem is that there wasn't much follow through. Through the short-sightedness of Xerox, they sold off everything they had that was worth making money with.
Back in the early 1980s Smalltalk was be seriously pursued by Xerox and about a dozen computer companies in partnership, as the next generation platform / OS / language. Programs would be portable across architectures without any special effort, the user / programmer paradigm would blur, and we would all be in control of our machines.
Meanwhile Alan Kay has been giving speeches about the good old days, working at both Disney and Apple as a research imagineer, and while he did manage to release Squeak 25 years too late, the cathedral nature of its development process made its progress go very slowly. Thankfully it has been forked which kicked the Squeak dev team in the pants. Anyway Kay had his chance.