Yes this is a big problem but a large part of this is the total elimination of starter homes from the market. I.e. they would be able to afford the types of homes that earlier generations started in, but those homes simply don't exist anymore.
It's kind of a quality of life degradation, but it's a bit more complex than just "an attainable item is no longer attainable." It has never been normal to buy a 2600 sqft, 4 bedroom home at the start of a career.
That's true.
From what I can see, those houses are being brought up by corporations, and turned into rentals.
Rental-only society is definitely possible (see Manhattan and Tokyo), but is a very different model from the traditional American suburban dream.
It's not that starter homes were eliminated or were torn down, it's that construction stopped in cities. The downzonings of prior generations, combined with the limited ability to expand by car travel, finally hit its limit and the urban planning apparatus was in complete capture of people who didn't want the built environment to change.