Most graduate school students don’t do research and don’t go on to do a PhD though? And what’s wrong with having more researchers?

> what’s wrong with having more researchers?

Nothing wrong with it. However what is right about it? The world needs research, and that means researchers. However for every person in research the world needs a very large number of people in non research. The guy who works at the local sewer plant isn't doing research, but the world would fall apart if nobody did that job, while the world would still continue with nobody in research (I wouldn't want to live in either world, but the world of no more research is better than the world of no more sewer systems)