The man who’s spent the past six months roiling the opera world talks about abandoning his New York City Opera job (“I accepted some sacrifices, but there are limits”), his take on that company’s future (“I’m afraid it will disappear”), his bid to run Bayreuth (“a question of principle”), and the great flaw of the French. And he’s very proud of what he achieved at the Paris Opera (lower ticket prices, a younger audience, and a ticket sales rate of 92%).