No, for example if you have only 12 teams in division I, and still 4 teams could relegate. Then have 48 teams in division II, split into 4 leagues. The top 8 would play in the playoffs. The bottom 2 could automatically demote.
As for the remaining 2 teams... They could have a relegation series with 2 teams coming up from the division below.
It would push the pyramid down but at least the ratio of teams per division promoting would be more favorable.
I also don't like the current conference system. I would rather play all teams twice.
Run of the Mill Canadian Manager