According to the LA Times, governor Jerry Brown wants to see "more teaching and less research" in the University of California.
I could see the state of California making that choice. Maybe we U.C. professors teach too few undergraduate courses for our state's needs. (I teach on average one undergraduate course per term. I also advise students individually, supervise dissertations, and teach graduate seminars.) But here's a thought. If it is valuable to have some public universities in which the undergraduate teaching and graduate supervision is done by the foremost experts in the world on the topics in question, then you have to allow professors considerable research time to attain and sustain that world-beating expertise. Being among the world's foremost experts on childhood leukemia, or on the neuroscience of visual illusion, or on the history of early modern political philosophy, is not something one can squeeze in on the side, with a few hours a week.
In my experience, it takes about 15 hours a week to run an undergraduate course (longer if it's your first time teaching the course): three hours of lecture, plus lecture prep time, plus office hours, plus reviewing the assigned readings and freshening up on relevant connected literature, plus grading and test design, plus email exchanges with students and course management. And let's suppose that a typical professor works about 50 hours a week. If Professor X at University of California teaches two undergraduate lecture courses per term, that leaves 20 hours a week for research and everything else (including graduate student instruction and administrative tasks like writing recommendation letters, serving on hiring committees, applying for grants, refereeing for journals, keeping one's equipment up to date...). If Professor Y at University of Somewhere Else teaches one undergraduate lecture course per term, that leaves 35 hours a week for research and everything else. How is Professor X going to keep up with Professor Y? Over time, if teaching load is substantially increased, the top experts will disproportionately be at the University of Somewhere Else, not the University of California.
Of course some people manage brilliantly productive research careers alongside heavy undergraduate teaching loads. I mean them no disrespect. On the contrary, I find them amazing! My point above concerns only what we should expect on average.