I agree with law professor Glenn Reynolds: it's bad that American is entirely dominated by lawyers. Put some non-lawyers on the Supreme Court.
But law is supposed to govern everyone's actions, and everyone is supposed to understand it. ("Ignorance of the law," as we are often told, "is no excuse.") But when the Supreme Court is composed of narrowly specialized former judges from elite schools, the likelihood that the law will be comprehensible to ordinary people and non-lawyers seems pretty small. (In addition, a recent book by my University of Tennessee colleague Ben Barton makes a pretty strong case that lawyer-judges systematically favor the sort of legal complexity that, shockingly, makes lawyers rich. He, too, recommends non-lawyer judges, which, as he notes, are common in other nations and were common in colonial America.)
The Supreme Court is one-third of the federal government, and the other two branches, Congress and the presidency, are already dominated by lawyers. But there are hundreds of millions of Americans who aren't lawyers, and surely some of them are smart enough to decide important questions, given that the Constitution and laws are aimed at all of us. Shouldn't we open the court up to a little diversity?