Any illusion that NAFTA is a tri-national free trade association ends if Canada and the US proceed in the manner described in this article.  In its place will be the US with two binational free trade agreements, each with much smaller economies and both agreements roughly stitched together.  This is not the way to manage trade and development covering North America; especially for Canada and Mexico.

If the US (with a complicit Canada) essentially dictates terms to a weakened Mexico, Canada becomes isolated and has a hostile Mexico.  The revised NAFTA (or whatever the new post current NAFTA interlocking set of agreements is called) would lack a necessary basis of goodwill between its 3 partners to function adequately and the supply chains linking companies and industries in Canada to Mexico will be subject unduly complex and tenuous administration and protection.

Further, when the Trump administration later makes unreasonable demands on Canada, Canada will face this threat alone.