The speculation is the diplomatic awkwardness of potentially having different rules for the southern border than with the northern border. They may not want to be 'discriminating' towards Mexico which, as I understand it, has really botched its vaccine roll out. I don't mind. Let fully vaccinated and negative PCR test Americans come north and spend their money. It's no big deal if the USA keeps the land border shut to Canadians for awhile longer. Who wants to go south of the 49th this time of year anyway?It is strange that the Americans are not reciprocating with opening the land border since it was them doing the bitching and complaining about Canada dragging its feet with respect to coming up with a border reopening plan.
There is some risk of Americans being carriers as they come north but the percentage would be incredibly small (double vaccinations plus negative PCR test). The risk is minimal for fully vaccinated Canadians anyway. Both USA and UK results are showing a very small percentage of double vaccinated covid cases showing up in hospital and that is really what the vaccination program is about to begin with. Like having a mild cold or flu.
Besides Canadians were far too early in dropping the mask mandate by a least a month. We need a higher percentage of double vaccinated folks to keep transmissiibility low. We continue to wear our masks when in indoor settings and will continue to do so for at least another month or so. The vast majority have ditched their masks. Shame on them.