Unlike London, NYC is not a national capital. And the NYC financial district does not get the same sort of legal special privileges as The City of London proper.
The existing trend of people and businesses leaving NYC will accelerate as it never would in London.
Perhaps even "Wall Street" will move. They've had contingency plans going back to the Cold War.
A lot of speculation that Wall Street will move to Dallas.
Come on down to “Y’all Street” here in Texas!