I think that's a long way off. For the most part, the McMansion houses are boxy, ugly and cheaply built. Retiring baby boomers on fixed incomes don't want to live in a house like that. People are downsizing, but personally, I still like to have some space. And some of the deed restrictions they have in these "master planned" communities are just plain silly.
I have a goal of never living anywhere that has a homeowners association. So far so good (but getting more difficult as time goes on).