You assume that there's an objective standard in academics and there is not. And if there is, it will not be followed by academicians, your proposal would simply lead to left-wing academics declaring to be "productive" other left-wing academics.
What are you, a bureaucrat? You're not thinking "outside the box." I don't care if it takes 50 years. It's time to plot the scrapping of the whole damn system and replacing it with a different one. Plans have to be made to do it one step at a time.