“Just as New York is shaking off its sorrows and crawling out of debt, making new claims on the world stage with a bid for the Olympics, our museums seem to be going through weird convulsions, falling apart, abandoning their collections, being hijacked by trustees or suffering delusions of grandeur. This is their most precarious moment in many years.” From the “perennially insecure” Whitney to the dumbed-down Brooklyn Museum to the cash-strapped Guggenheim, it seems that none of the city’s venerable art institutions are safe from the new malaise.