I promised that I was going to stop talking about higher ed, but I can't. I'm in the midst of writing an essay, and I need some input from all you over educated readers. 

Some have suggested creating two tracks of professors: those who specialize in teaching and those who specialize in research. Both tracks would be equally compensated and rewarded. Those who teach would have fewer research expectations. Those who do research would have minimal teaching responsibilities. 

This idea has been kicking around for a long time. Have any colleges actually acted on this? Why hasn't this plan ever been implemented?