I've heard about the shrinking middle class in the US since around 1990. It somehow doesn't actually seem to be smaller now than it was 35 years ago. More and more ordinary from the bottom third of the population can afford things that used to be reserved for the upper third.

Are you sure it's really been/being hollowed out or are you just repeating something you've heard or read other people state so often that you think it's true?

That's not been my experience. Technology has advanced such that there are things that used to be expensive that are not any more. However, I don't see more people who are able to live middle class lifestyles. Things like owning their own homes, not having roommates, being able to leave demeaning jobs, only having to work one job, raising a family on a single income, etc.

This doesn't map exactly to "middle class" but it also seems like there's now a lot less ability for people to afford to work in "artist" type careers. It used to be that you could wait tables, get a low cost studio in the city, and work as an artist in the evenings/weekends. Now you have to work multiple jobs and probably still can't afford to live in the city and make art.