Well, the guy who ordered the expulsion was overstepping his instruction, so it would be totally plausible for the expulsion not to take place.
My guess is that alt-NewBrunswick is even more heavily francophone and that alt-Canada would be too. The Quebecois might find it harder to maintain the claim that they ARE the french nation in Canada.
There were already French speakers in Louisiana, and the number of Acadians who went there is often overstated, so I don't know how much difference it would make, except that the name 'Cajun' wouldn't be used!