“Winter on Broadway usually means a winnowing of shows as tourists leave town after the holidays and the audience in the New York region tends to stay home. Several shows, like “Cabaret,” closed in early January in expectation of the long, fallow cold months. But the first weeks of this winter, after a fall season crowded with money losers and critical pariahs, look a bit grimmer than usual because of bitter weather and continued doubts about the economy and tourism.”