> The lifestyle is very hard, even if you make a lot of money, because the public transportation is insufficient to cover everything you want to do in your life.

Public transportation is the limiting factor in determining what you want to do in your life... even if you have a lot of money???

Once I had enough money, I bought a house 20min from work, 15min from an excellent park for mountain biking, 25min from SJC and 45min from SFO.

All of that can be done by car much faster than public transportation ever could.

Whether or not this is sustainable for a large population is a completely different discussion. But your premise is flawed.