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.
I have found most people who decry tenure only have experience with tenure at the elementary and secondary school level. Trust me, if you didn't have tenure, most schools would have to double their salaries right off the bat.