Just spitballing here, but the “dream job” question might also come down to the destruction of the middle class (and the recognition thereof). 20 years ago it looked a lot more like you could make a good living working for someone else, doing something interesting. Plus there was more trust that employers would “do right” by their employees. There were pensions and quality healthcare benefits.

Now all that (and the security it brings) has dissolved. It may not be Gen Z people wanting to make it big or be a celebrity, but a desire to live comfortably and seeing that they can’t trust an employer to let them do that. If the only way you can build security for yourself is by building a big pile of money, then people are going to seek that out.

Edit: and when I say that “20 years ago” these things existed, I don’t mean that they were still functioning like they did another generation earlier, but it was way better than it is now and there was less awareness of what was happening.