There is a big shortage of mid-size dance theatres in New York. “The Joyce seeks to place dance at the front and center of the debate over how to redevelop Lower Manhattan, and central issue is space; that New York’s dance card is full this year only underscores the demand for it. What is needed, dance producers and company directors say, is a midsize-to-large dance theater (1,000 to 2,200 seats) with stages big enough to accommodate large companies with productions — classics like “Swan Lake,” for example — that require more scenery than a backdrop and a few props.”