There is probably enough east coast Republicans that would vote for him and ensure the Democrats keep the white house.
There is that segment that will vote for him. It's always surprising to me to see some otherwise conservative minded people support him. Steve Forbes is a good example. He otherwise is very fiscally conservative and freedom oriented, and has some great ideas regarding taxes and free markets, but because Bloomberg supports Wall Street, people like Forbes will kick other freedoms out the door.
I see that a lot with many people interviewed on Fox Business. They're all for market freedom, and will sell out other freedoms to keep it. Most of them are from the NY, NJ, CT areas within commuting distance of NYC. "Blueblood Republicans" I guess.
This is an example of the "New York values" that Cruz talked about as what we want to avoid, and that Trump defended.