Karina Smigla-Bobinski’s ADA, an inflatable work spiked with charcoals that will leave marks on the floors and walls. For anyone hoping for a South Street Seaport revival, the past few months have been a downer. Longtime mainstays, like the local outposts of Fellow Barber and Malibu Farm, have decamped; the Di Fara Pizza outpost closed last year.