I can't help but feel that many people who now work remote and therefore don't need to commute suddenly are all for moving to mass transportation...that other people will use to get to work.
Can't say why the movement picked up exactly, just like everything, there are cycles, and after decades of building highways all over our cities and realizing how bad the situation got and how it never really "solved" traffic, there's just a return to a different way of planning cities.