I don’t live in suburbia, I live in a tiny hamlet with cows for neighbours.
I agree that cities cannot be all detached homes, but likewise they cannot be all high-rise either. Where my wife and I come from ( France and UK respectively) high-rise experiments have always ended in poverty and decay.
I could buy a crappy little flat in a city with junkies for neighbours, or I could buy a massive house with space for a pool 40 minutes drive away. Which would any sane person choose? Am I saving the environment driving around in my SUV? Yes, because we hardly use it thanks to the internet and us being fit.
My feeling is the current status quo will continue:
Young people live in flats in town. Kid #1 comes along and it seems fine. Then #2 arrives (plus they start having a bit mor £€$) and things start getting a little tight. Also the downsides of city life start outweighing the upsides (people drinking and shouting at 2am is more annoying when you and your kids have work/school).
Obviously that is a gross generalisation, but I have seen the pattern all over the place.