Traditions and how remarkably well East vs West has worked for decades aside ...
3 divisions of 3 is NOT good math.
Remember all the times that 4 western teams have had better records than 2 or 3 eastern teams in the past. With even smaller divisions you are begging for crappy teams to win a division and decent solid teams to finish last.
Let's take 2014 into consideration already. We would want to keep Hammy and TO in the same div, so Ottawa would most likely be in the central with the Peg and Sask. No one expects Winnipeg to be a powerhouse any time soon. Ottawa, no matter how well run they are will still be an expansion team with growing pains and it is not far fetched at all to say that the Riders could be sub .500. Then look at the West, BC probably still a powerhouse especially how young they are, Calgary very strong and very stable, and not too far fetched to say that Edmonton may be .500 or better.
We could have Sask winning a division with 8ish wins and Edmonton finishing last with 8ish wins. And this phenomenon could be VERY common given that the divisions are so tiny small.
Usually these types of scheduling ideas come from people who just need to see even numbers, all nice and tidy. Usually all the same folks who want Halifax in at all costs so that there can be 10 teams but then say no way to Quebec because they don't want 11. 10 is such a nice even number. Bollocks I say. If there are 9 solid owners and 9 viable stadiums, then 9 teams it is. If there are 11 owners and 11 parks then 11 it is. We can always make the schedule work. Quit worrying about stupid details like nice even pretty divisions. Get over it I say.