The busiest Airline in the world is cutting flights to the U.S. because of lack of demand. Even with both versions of the Muslim ban blocked by the courts, both that and all the stories of arbitrary detention of legal Visitors at the airport will have a profound impact on the number of visitors willing to come to the U.S. (Emirates and other airlines are also subject to the new electronics ban, which will make things even worse)

Trump is raking in so much money by requiring the Secret Service to bust its budget paying for rooms at Trump properties, so maybe he won't notice when his occupancy numbers dip for lack of foreign visitors. But other businesses in the travel industry will notice, and I doubt they will keep quiet.