While it's tempting to think that the closing of Copia, Napa's ambitious wine and cultural center, is a sign of the times, the fact is that the organization has been troubled since its inception. Robert Mondavi raised and donated much of the money for its construction, despite the fact that there was little indication of how Copia would sustain itself. It has had trouble drawing crowds and has never become that first stop on the Napa wine trail that its creators hoped it might be.