I would find it hard to believe that hospitals are dependent on these countries for their success. The major universities however all have departments devoted to attracting international students including students from the countries on the banned list, for the simply reason that it is a cash cow. Universities stand to lose millions in the inflated fees that are charges international students. Canada has similar programmes although not as lucrative. generally the fees run in the range of $30 to $40 thousand a year. Doctors in training do pay large fees as well in Canada, many are from Saudi Arabia.  A great many return home to practice