Licensing, rights - sure. His possession, for him to rule over however he wants.
It has, however, also become a symbol, whether the owner recognizes it or not. It's a symbol for NYC and a symbol for Wall Street.
If he takes the bull out, he'll take away a bit of culture - of the city, of the nation and of the world. I doubt there's a replacement he can do that will have as much weight, culturally.