That would be economic suicide IF...
Who you think going to be the first to do it?
It's done emotionally.
However, it could be a part of a multi-step plan by the EU and Canada to restructure their economic ecosystems to strengthen each other with highly encouraged and orchestrated trading/tourism between nations as a way of going cold turkey on the U.S.
You can make it where only certain types of travel are allowed.
That would be a scary development.