Although the article is fairly bleak, one could position their portfolio against equities that have a strong focus in Canada.
If you look to my portfolio, there are very few companies I own that do business directly in Canada. In fact, the only one I could think of is a company like Telus.
When we look to many of the Canadian Foundational Stocks, many of them have the majority of their operations south of the border. Think Waste Connections, Fortis, Constellation Software, Couche-Tard. And when we do look to the companies with a targeted Canadian focus like Loblaw, they are necessities. Something people need no matter how bad the economy gets.
Even a mid-cap company in my portfolio like Boyd Group Services, although Canadian traded, derives 90%+ of its business from the United States.
Portfolio diversification is how someone should respond. However, your portfolio should be diversified at all times. Don't mistake TSX-listed equities as Canadian exposure. Many of the strongest companies on the TSX have gravitated towards the US over the years as it is a faster growing economy.