Nope this guy has a good job. Not about mobility. This is about rentiers. People need to read "Progress and poverty" by Henry George. Land prices are the issue.
Not having a job isn't the only way to move down a tier. I think what a lot of cohorts are feeling (the economy is broken) comes down to (1) middle class upbringing (2) did the things middle class kids are supposed to do, like college, "professional white collar job" (3) results are worse than expected.
People's expectations can be set all sorts of ways, but the most obvious is comparatively to the group they believe they are or shoybe part of. Ie, parents, friends...
This is all at the personal level. There are also macro trends and dynamics in the economy overall. Haven't read George, but Picketty (recent Nobel laureate) has a very good theory for this. I don't know how George uses "rentier" but "returns to capital" probably encompasses.
