Probably not. It’s not so much the demographics of NY, which are bad enough. Democrats usually poll 75-80% in the city during presidential elections, about a 1,000,000 vote margin. The real problem is the LI suburbs, which used to be heavily Republican but now lean Democratic. Trump will make it closer. He may pull 30% in the city and do very well upstate and in the NYC suburbs, but i doubt he can pull the state out. Plus he will be running against Hillary who is of course of ‘New Yorker’. Aside from the obvious demographic issues, there are still inordinate amounts of stupid white liberals in the city and they all vote Democratic. However, Trump will poll very well in the Midwest and in some of the New England states, New Hampshire, and possibly Maine or Vermont. The problem in NY and NJ and CT, is quite simply demographics.
I ask because several of my democrat friends are excited about having a non politician who is not dependent on lobbies in government