But only a small percentage of the games would be played

in Mexico and Canada. It is not as if every team would be regularly traveling the Mexico City to Toronto/Montreal/Vancouver. It's much more likely that teams will be traveling to/from Mexico City from US sites, many of which likely would be in the southern half of the country. In that respect, the Manaus site was worse in 2014 because it was so far out there w/r/t most of the other sites.

As far as 5.5 hours between Mexico City, my flight from Mexico City to JFK was closer to 4 hours than 5 and a half as far as actual flight time was concerned. Not sure how going to Toronto adds another hour/hour and a half but ok.