I'm really not as convinced that mass transit is a good deal. Certainly, there are some places where it is, and some huge benefits. Less time/money/space spent on parking, for example. But the oft-cited statistics about energy-use-per-passenger-mile, while true, are far from the whole story - The human cost in additional time spent commuting and inflexibility of schedule are very real. It takes me twice as long to get to work by transit as by car. It's just barely on the cusp of not worth it - and significantly because SF lacks in parking. It means that I've got to time my comings and goings carefully - I used to work 40 hour weeks as 2x12-14 and then short days the rest, but I can't anymore, because if I stick around till midnight coding I can't get home. If you look at it purely from a "how much does commute cost" perspective, sure, mass transit looks cheap. But it costs humans real time to do. Time is money, and the hour a day I spend in additional commute time, trapped in a small box with smelly homeless dudes, is really not worth my time. It's only because of 'opportunity cost' that I bother with it - I couldn't spend that time making money, and it's value to me in additional entertainment is significantly discounted from my normal rate only because... well, I think I've just talked myself into quitting and getting a job literally anywhere else, because I'm utterly sick of the commute. And at 45 minutes each way, it's really not that bad!
To a certain extent, because it's so cheap to aggregate, we lose out on opportunities to differentiate. Rather than spreading out so we work close to home, we build giant throughfares that make for clear divisors - And then do insane things on top of that. Look at the commute times in and out of SF - the traffic is really bad flowing both into and out of the city, because lots of peninsula-working persons want to live in the city and lots of peninsula living persons want to work in the city. (I say this with great hypocrisy, living on the peninsula and working in the city, but at least I'm in Millbrae and not Sunnyvale).
The same thing has happened in manufacturing - It's so cheap to produce mass-market products, and they do enough in most cases, that it's basically impossible to find semi-niche products in many areas. You can buy cheap Chinese goods or pay 20x the cost for high quality American made, but there's no mid-market anymore. Every so often a product comes around that is mid-market, but when people flock to it, it inevitably goes down in quality. My example is Lands End jeans - In the 90s, they were great. Then they got popular, got bought out, and are now just another branding for cheap goods.
When working from home becomes more acceptable, cities are going to look like things of the past - Full of only collectivists who can't live without someone to praise them at every corner, and the poor and downtrodden who've gotten stuck in the ghettos. This is, of course, cyclical, and been given several names - "White Flight" being the current pejorative for one of the major cycles. But I'm looking forward to being a Solarian[1]; VR for interaction, Automated cars when I need to be somewhere or to transport goods, and high-bandwidth network links for everything else. I don't see anyone else arguing for lining fiber everywhere we run power to, but when I do, I will gladly vote for them.
[1]https://en.wikipedia.org/wiki/Solaria#Isolationists