I think Usports has a pretty big gap with the haves and have nots.
Teams like Laval, Western, Calgary all likely could compete at a level above the other teams in Usports. if you are talking as a one of keeping all the same parameters as they have now I think the top teams could maybe compete, not make the play-offs in division 1-AA, although that's likely a stretch, probably would be a better fit in Div. 2. The others would be similar to Simon Fraser and be in the div. 3/NAIA range.
The biggest issue for the Canadian schools would be QB. I don't think Canadian highschool throw the ball nearly as much as they do in the States so the QBs they normally get just aren't at the same level. So if you moved them into those divisions and they were able to more easily recruit those kids from the US with the appeal of them playing in the US football system instead of Usports then I think they could more easily compete. They will still have to attract them to Canada but I think the change in division from Usport to NCAA would help with that.