It's not really wild talk. Beginning with my daughter's high school graduating class, I noticed that the kids who were on the bottom of the academic pile were criminal justice majors. Many of the CJ majors are in remedial or developmental classes. At least half of them, given "why I chose my major" as an essay topic, write that they like to have power over others. It is true that the other half writes that they wish to serve their community, but the power seekers are frightening.
And, of course, there are people at the bottom of the academic pile who will do well. There are so many fields for which an academic preparation is unnecessary. Retail comes immediately to mind. In fact, there is no field in which personality is not an important factor.
And, yes, there are people who achieve well in school early on who do miserably later. I went to college with a woman who was the Catholic college equivalent of Phi Beta Kappa and who earned a Woodrow Wilson Fellowship who was not accepted to graduate school. Her basic problem was a total lack of social skills. Late in August, the nearest state university finally accepted her. My daughter went to high school with a girl who did all honors level classes and who finished in three years. She wanted to major in theatre but no college accepted her. A year later she was admitted to a school as a sociology major.
And, finally, there are people in the upper ranks who don't succeed because they either too dreamy . . . too stereotypically academic . . . or because they have Ph.Ds in over-crowded fields.
All this leads us to the notion of stereotyping itself. A great many stereotypes are based on facts and there is a germ of truth in each stereotype.