Sticking to the facts ans leaving any political commentary aside - International travel to the US is down in 2025, this has been regularly reported, and yes, it is a contributing factor (but not necessarily the main one) driving the many discounts we are seeing out there. I don't know the numbers, but Canadians aside, it is my working theory that
DCL has a few more international guests on board than other cruise lines. In itself, I would not see that altering where DCL positions their ship - but ultimately, could impact their growth plans, as it would with any other cruise lines. As it has been pointed out, San Juan could be an interesting alternate, but cruises ouf of there struggle to fill (although I could argue it has to do with time of year)...and San Juan is increasingly difficult to get to, especially off season. From Canada, I have zero direct flight options when DCL has a ship there. As an aside, San Juan is often used as a port for crew rotation IME.
Now, the reverse is also true. There are less people from the USA travelling overseas or crossing the Canada-US border. A recent report from the Canadian cruise industry saw a significant drop in the # of US travelers on cruises departing from or having a stop at a Canadian port of call. That, I could see DCL rethinking their Fall 2026 strategy if it included NYC departures with the occasional Eastern Canada port of call.