Will the U.K. move next to a more serious discussion of a British exit from the EU? Opinions are expressed on both sides, of course, but there's no real discussion. The loudest voices insist that Britain must quit to save its democracy -- or that leaving would cause such colossal economic harm that the idea is simply nuts. As yet, there's been no grappling with the trade-offs, no weighing of pros and cons. This ought to change. Perhaps it now will.