It was only a matter of time before this happened: “The Big Bank,” the musical. It’s got foreclosures, an environmentalist and a whole lot of hand movement (see trailer, below), and New Yorkers can catch it tomorrow for the end of its run at the New York Musical Theatre Festival. It truly is “of our time,” as its tag-line advertises. The only catch? It was actually written sixteen years ago, back in the middle of the roaring 90s. Sometimes artists have more foresight than analysts.