That'd be an idea. Actually, I have no idea if this has been brought up, but since the NA pool of racers is somewhat small, why not just make something like 4 divisions, with cross division races where the grids are separated by general championship standings, leading to a hockey playoffs styled series at the end of a season where the fastest of each division battle it off for a cup?
That way, you get people from the same general timezones and countries racing together, but those grids don't require amazing lap times to enter. Then when you do cross-division races, the faster guys get paired up, and the slower guys get paired up, leading to the fastest of the slowest getting roughly equal points to the slowest of the fastest. At the end of such a season, the slower guys would have a better chance to get in the finals.
Basicly dividing east/west and north/south, you get 4 divisions, and hopefully (provided attendance for each division's around 10 people) you get 40 people racing towards a championship. This way, you get a 4 sided regional challenge, where both the slower and faster guys fight to represent their division on the global championship. It'd be a nice way to merge a canadian only league into a NA league.
I know that it'd be pretty easy to get at least a couple guys from eastern Canada, we get a solid 8 in our Quebec league each 2 weeks, with peak attendance of roughly 15.
Anyway, I'm all for getting more league races, be it global or canadian. But I do like the idea of canadian/regional subdivisions.