Not sure if you meant we are pretty much @ sweatshops, or pretty much at instantly portable jobs and families.Welcome to 2017. We're pretty much there.
If you meant the latter, I actually think that's one of the bigger fallacies of modern times. Sure we have a lot of tech to deal with telecommuting, but there's still a huge premium placed on in-person interactions. Plus, be careful about the privilege assumed by what you imply - even in high-tech times where white collar workers can telecommute, high-touch, in-person service work is still a big part of the urban workforce...and these are the people that often live far from the city core.
If you have a job that you can quit instantly for a better one, on a whim, whenever/wherever...or one for which you never need to leave your house...then congrats to you. But for most, the labor market is more bargaining-power-asymmetric than product markets. The customers actually rule when it comes to cereal, shoes, clothes, etc. Not so with jobs.
Plus, if no one needed to commute into or work within our city, then we wouldn't need a city (or transit, or buildings, or parks)...it could just be like The Matrix where we're all just plugged into a pod : )