In my neighborhood there is a carpenter married to a pediatrician, but I have a hard time coming up with more examples. Degrees don't seem to me to mean that much here (the US), unless one knows the school and sometimes the program. Having said that, there is a profound snobbery one finds here and there against the degree-less.

I have been out of the dating market for almost three decades, so I can't tell you. A friend did say that young women he knew regarded marriage as a system of control they didn't care for; but he is my age and I don't know how big his sample is.