There might be economic pressures, but all in all the pull factors of urbanization seem to dominate. Sure, some of the jobs are bullshit, but people by and large prefer them over farming jobs. Part of that is of course cultural and I think we really need to make agricultural jobs more attractive to young people, but in the end it is up to them to decide, and currently most seem to prefer city life.

As for a symbiotic relationship, sure I absolutely agree! However that symbiosis will have to take a vastly different shape than nostalgic patterns of a largely imagined past that most people would probably hate if really reestablished. And cities are not incompatible with the idea of symbiosis with nature, in fact given the total population we already have, they will likely have to play a central role in it.