As long as there’s land and as long as we do not see Asian style population density, i just don’t see the end of suburbs.
Personally I do think overall it is better for the earth to be in a crowded city environment. Better for ones health too as there will be more reliance on walking. But I doubt that’s going to happen any time soon.
Especially with the way SD is structured and the way people are telecommuting. The survey on commute was very telling, Almost 75% had commutes less than 20 minutes. And I don’t think piggs are all concentrated in the core of the city. Rather a huge reason is the telecommuting and the proximity of high tech jobs in the suburbs.