No, Trump, Canadians do not flee en masse for US health care. In fact, few do — pretty much just rich people.
Myths About Canadian Health Care: “Myth #1: Canadians are flocking to the United States to get medical care. … Myth #3: Canada rations health care; that’s why hip replacements and cataract surgeries happen faster in the United States. Myth #4: Canada has long wait times because it has a single-payer system.”