American schools are more segregated by race and class today than they were on the day Martin Luther King, Jr. was killed, 43 years ago. The average white child in America attends a school that is 77 percent white, and where just 32 percent of the student body lives in poverty. The average black child attends a school that is 59 percent poor but only 29 percent white. The typical Latino kid is similarly segregated; his school is 57 percent poor and 27 percent white.
There are clearly some places that our current educational system could stand to be reformed. I would rather focus on issues like segregation and access rather than whether removing tenure would be a panacea.
h/t Tyler Cowen of Marginal Revolution