Retirement in opera is a delicate thing, especially when it comes to legendary performers like Plácido Domingo. While I understand it is common in sport stadiums to see drunk frustrated fans screaming “TIME TO RETIRE” as an aging player is walking off the field, I had yet to see something comparable in an opera house. That was before last week. New York Times’ critic Anthony Tommasini’s review of this year’s Ernani at the Met in which he called for...