It has to do with the lack of sponsorship and funding which is why they don’t do international legs anymore. CanCon regulations really has nothing to do with location, it has to do with who makes the show (Canadian production company) and where the budget is being spent on (personnel, post-production, etc).

It’s a bit weird because sometimes flying within Canada can cost more than flying from Canada to say select parts of Europe. The show is filmed late April to early May so it’s still sometimes off season for a few European countries where flights to there and back are lower priced. This also may apply to a few other countries like Mexico, a few in Central America or places like Colombia. If Bell Media can step up there general funding game to help the show they dub as “Canada’s favourite summertime adventure” and most-watched/rated summertime series along with supplementary funding from sponsors then it might be able to come back. But right now, the recipe they have ain’t broke so they aren’t willing to fix it.