What does the appointment of Peter Gelb to run the Metropolitan Opera mean for the country’s artistic future? “What will his artistic priorities be? This question can’t be answered without knowing what James Levine intends his own role to be now that his title has been downsized from artistic director to music director. Will Mr. Levine, busy in his new job as music director of the Boston Symphony Orchestra, and Mr. Gelb divvy up the artistic responsibilities? It’s not yet clear – not even, I suspect, to them.”