So you want to restrict people from getting a phd unless they can get a top job out of it? What about people who want to do research but aren't worth the pay/re

So you want to restrict people from getting a phd unless they can get a top job out of it? What about people who want to do research but aren't worth the pay/responsibility of top jobs? Is your goal to increase the value of a phd by limiting it to highest quality people possible (like with MD's)? Tenure is a benefit that is given instead of money to keep you from leaving for more money. It may be nice to have late in your career if you want to keep working forever or bizarrely want to stay at your research-focused school but focus on teaching. But money adds up nicely and has more flexibility. And like with job offers and promotions everywhere, it's something you generally can only get if they need you more than you need them.