Capital collection, distribution, and creation is a global industry now, and it doesn't really require buildings in New York anymore. Bad for New York City in the long run, but it's great for the world. Capital is the world's most important commodity and even the most powerful governments must now bow at the altar of free market capital.
Wall Street is now a global, virtual, electronic street which is now, in many ways, run by computers. Decline and Fall, at NYM.