Sooner or later, EU citizens and political leaders will have to decide which Europe they wish to back: a highly integrated political union with major policies decided from Brussels, or an economic union of sovereign nations with central coordination reserved primarily for issues of mutual economic interest. Neither of these two options is guaranteed to succeed. But trundling along in a political and institutional halfway house, with policies that upset a lot of people but no serious attempt to articulate a shared vision of where Europe is headed or what it stands for, is a recipe for political mediocrity, disillusionment, and chronic instability.