At 8:30 p.m. on Tuesday there was no more coveted piece of New York City real estate than standing room in the Museum of Modern Art’s Marron Atrium. And so it shall be for the next seven nights as Kraftwerk, the German electronic outfit from the 1970s, plays to a scant crowd of about 450 lucky souls. That this quartet, which includes just one of its original members, can command a showcase like MoMA – and sell out in a drumbeat – provides a useful lesson into technology’s risk of obsolescence.