He has good ideas about what America is all about. I find it difficult to see anything to object to in what he says, although his data do support the outrageous ideas that the cultural foundations of "the American project" remain keys to building a decent functional life which does not cause trouble or add burdens to others: Industriousness, Honesty, Marriage, and Religion.
Ultimately, though, he is talking about character traits and American civic culture. Worthy character traits support civic culture, and vice versa. Think Boy Scouts and Girl Scouts. Interesting quote: "The upper middle class is keeping its effective values to itself." Also, his point about "churn" seems important, because in the US lineages go up and down socioeconomically and socioculturally over time. No fixed classes as in most societies and it's not mainly about wealth either.
I posted on this topic previously: Class, Social Capital, and Character Traits
His wonderful speech from 2011 video here. I think it anticipates Trump. The Q&A at the end is good.