“Smith is now two days away from the opening of the first show of his first season at the Flea, Thomas Bradshaw’s ‘Fulfillment,’ a comic drama about New York strivers and a supposedly perfect downtown apartment. The season also happens to be one of the last before the Flea — founded in 1996 by Mr. Simpson and others, to raise ‘joyful hell in a small space’ — itself trades up to a new $21 million home. It’s tempting to spot a sly metaphor.”