I would be cautious about overly rigid rules for a commission or commissioner ahead of time. Canada's party system is much more fluid than, say, the United States' or Great Britain's. If you look at the list of parties that have been competitive in this country in the last 25 or 30 years, you're at over half a dozen pretty quickly. The example of 1993 is very striking. Two parties that hadn't existed, at least at the level of official recognition, were the two parties that became the leading opposition parties.
I think, when you look back to the inclusion of Elizabeth May, that was a programming decision made by the networks based on what they thought would make exciting television. I'm not saying that it was a mistaken decision democratically, but those should not be the principles on which those decisions are made.