Is it me or does anyone find the proposal full of arrogance? It is not as if the Americans own the cruiselines are are able to dictate their stops. Vancouver and Victoria are extremely appealing as port stops and the cruiselines know this. The trip up the coast outside of Canadian waters would not be that appealing.
While small, we do have a domestic cruise industry offering summer and fall cruises along the Seaway and beyond. Due to ship size, they aren't subject to the current GOC restrictions on cruising. Here's a Fall Harvest and Colour Cruise, one of many offered by St. Lawrence Cruise Lines:
https://www.stlawrencecruiselines.com/cruises/fall-harvest-and-colour-cruise/
Would you like to sail a bit further afield? Here's one of several companies offering itineraries varying from explori