Why not? It seems like finance fills the “marquee industry makes a small percentage of the population very rich” for NYC.

And many other industries make other small percentages of the population rich. It's not a one industry town like many places in the rust belt were and Silicon Valley currently is

Silicon Valley goes beyond tech with finance being a solid example. In the end many people are getting rich from other industries as all cities need a wide range of services like plumbing and heating/AC which opens up a lot of opportunities to start and grow a business in those industries.