What makes you think this would solve the corruption problem? Cops aren't corrupt because they're dumb, they're corrupt because the institutions they are part of allow and reward corruption. Without some mechanism to change that culture, simply adding more members to it will only bolster it. College degrees don't have anything to do with it.
> I bet a lot of college graduates would kill for a pension right about now.
Literally! They might but that doesn't make it a good idea. We don't need more police we need to change the role of police in our society.