I'm sure the boycott will soften somewhat after Trump leaves (presuming he isn't made President for Life and heralding a new era in American governance) because people have short memories and will forget that almost all American officials at every level were either directly working for his platform or just sitting ineffectually at the side pretending to do anything but not really stopping it.
But it will only soften. It will not be over. Not for most Canadians alive today. The USA poisoned its brand but good and by the time Trump has stopped raging like a bull in a china shop, Canadians will have found new favourite brands and suppliers and such and American brands will be dead anyway.
Because once I find something I like, why would I go back just because the old brand says "but we've chaaaaaaaaaaaaaaaaaaaaaaaaaanged!"
Those ridiculous, unserious human (presumably) beings?
They probably honestly didn't think it was a threat. It is a common delusion in the USA that everybody wants to be American.