“Of the four other major Balanchine-driven companies in the United States — along with the Miami City Ballet, serious contenders include the Boston Ballet, the Pacific Northwest Ballet and the San Francisco Ballet — dancers now have viable alternatives. When Balanchine was alive, City Ballet was the Vatican; now, with directors like Mr. Villella, a City Ballet star of the 1960’s and 70’s who cherishes the kind of coaching in depth that is not part of City Ballet’s system, the choice of whether or not to stay in New York isn’t so clear-cut.”