I'm not sure. I think events outside of America will impact far more heavily than assumed by the president-elect. For instance, China is a hot contender for the reserve currency in 2020. If America loses the reserve currency, it essentially loses its financial strength. That will make even dollar millionaires much poorer.
America is already divided across educational & socioeconomic lines. In the future, I foresee increasing numbers of highly educated people (by American standards, anyway) immersed in poverty. Unless it's a degree in robotics, genomes, science, or math, I don't think a university education is going to matter much. It's been devalued as a result of dumbing down and been over subscribed.
"the idea of socioeconomic fluidity will become outmoded..." It has been substantially easier to rise in the European Union for the past 30 years. It's really difficult to outgrow poverty in the USA.