The New York Post Editorial Board writes:  American universities have plenty of reasons to rethink their business model, but a new one this week might actually get their attention: Fewer international students are coming to the United States.  Enrollments of new students from abroad fell by nearly 10,000, or 3 percent, in the fall of 2016, a report by the Institute of International Education noted Monday. It marked the first such decline in the six years IIE has been tracking the figure.