Unfortunately, Canada is facing ancreasingly protectionist Fortress America on our Southern border too. At least the UK has a larger population and a higher population density to absorb the impact of Fortress Europe. Canada's small population and low population density combined with Canada's own protectionist tendencies even at the provincial level make us extremely vulnerable. Canada needs to find new trading partners even more than the UK does.
Canada's bizarre in that it only trades with one country.
Even though the UK has the EU - population 450 million (after Brexit in March) - on its doorstep still only a minority of UK trade is with the EU.