Someday we'll be saying that travel is only for the rich - everyone else will be forced to use VR, and they will be brainwashed to like it. As they say, American lifestyles are only sustainable for the 1%. The rest of us should eat bugs and live in pods.
As we move into cities, production becomes cheaper - which means we produce more, which means we can support more people, which means we need to increase efficiency even more.
I'm not sure that this is preferable to life without technology. Aren't family and small moments the things that make life worth living? Squeezing out a few more years of expected lifespan hardly seems worth the tradeoff to me.
Personally, I don't think this is sustainable.