Nor has Canada pulled out of any official agreements with the USA .. so your assertion that we're "taking our ball and going home" doesn't hold water. 
This was a speech to put the USA on notice, as much as it was to prepare Canadians for potential change and inform our other allies that we're seriously concerned about their direction south of the border.
You say we're being foolish, so tell us, how would you balance our commitments to the USA, which is now helmed by an actual fool, with our commitments to the rest of the world?