The ideal solution is to convert suburban communities into walkable cities with viable transportation links between these cities that let working people commute in the same amount of time as they do now. And somehow to do it door to door. However, given that many businesses are as spread out as suburban housing, that goal may be impossible without scrapping everything over time. There is a valid reason people have to commute by car, unfortunately.

That transition in the suburbs is what is at stake in the next 1-20 years. Saying cities are the way to go is not enough. There are too many people and not enough housing stock to make cities alone a viable solution. Gentrification will only get far worse.