I agree that the 12 team playoff will be no better than the four team playoff. That's why I prefer a 66 game playoff for the top twelve teams called the regular season in the premier league relegation model. I know it will never happen but it just makes sense, not only for the first division but all the way down the ladder. It creates incentives and competition at all levels.
I know that people who enjoy Alabama winning 77-0 will disagree with me.