Yes, you are biased. There are more teams in 8 Man, but twice as many of them get a chance to try to win a State Championship. We already have teams with a win percentage below .500 in the playoffs. I don't know how much easier it can be to earn at least a chance. It is almost as if the regular season is meaningless as it relates to actually getting a chance at a State Championship.
By changing the Class structure as you are proposing, you in essence are doing exactly what you say won't work...you are just changing the cutoff number. You are just doing it in a different way and of course adding 9-Man.
The transition from 11 Man to 8 Man is really not that hard.
If "football is football no matter how many players are on the field", then what is the infatuation with 9 Man football? Your natural response might be to ask why so many are so opposed to it...which I would say is a pretty good question. An 11 Man school that is having trouble fielding a team will often times not get much relief from 2 less players. While that is a step in the right direction, it is likely not enough to help that school solve the problem. The problem is JV football. If the school doesn't have enough players to field an entire season worth of JV games, moving to 9 man isn't going to help. Until these schools can play a complete JV Schedule, their problems are not going to get better.
Teams are not forfeiting because Little Johnny is tired of losing. They are forfeiting because Little Johnny is a 14 year old that has been forced to compete against 18 year olds due to lack of participation, and Johnny is now in Concussion Protocol for the 2nd time this season. His buddy Little Billy has a dislocated shoulder, and their cousin Little Bobby has 3 broken ribs. These kids are giving everything that they have and more than they should. Let's try to throw a little respect at these kids rather than characterize them as poor losers or quitters. They have taken their bumps and bruises and unfortunately they can't absorb any more.
As far as what you are proposing here, I don't really have an issue with any of it. I think as long as you are willing to allow teams to freely opt up, this could work! I believe you will still end up with a few teams opting down, but I have never had an issue with that. You have obviously given significant thought to this, and this is a hell of a lot better than anything that I can come up with.
Good work!