Im somewhat jealous of what an opportunity this would actually be for private schools to have the best possible playoff bracket. Like you I would prefer classes based on competitive level which I think is possible here because they're already in conferences with each other for the most part so we already know.I've toyed with this over the years. Each time, I come up with something different.
The big unknown is always who is in the NIPL to begin with. Is it some private schools or all of them? Are non-boundaried public schools in or out?
For the sake of discussion, let's agree that it's private only and it's all of them. In a scenario like that, there are roughly 50 football playing private schools, so you can't have more than 3 classes of 8-team brackets in order to make it so that roughly 50% of schools qualify. That's why I like the concept of a 10-game regular season so that everyone gets that extra game and only the top half who qualify get to play up to three more playoff games.
How to qualify and classify those 24 teams into three classes is something where enrollment will need to be taken into consideration, but it wouldn't be the sole factor. You know me...I want to balance playoff classes as much as possible so that the 8 most competitive teams are in the top class. I don't want a situation where people could say that a team in one class was so good that they could have won the class above. I also want to try to avoid a situation where the least competitive teams in the top two classes would lose by first round blowout in the class immediately below it.
Qualification, classification, and seeding are unknowns at this point. I'd love to see a system that incorporates SOS and coaches' input in some way, and I think that's more easily accomplished with 50 football playing schools than with ten times that number. I know you don't like this, but I'm not against some sort of success factor. I'm against it in its current format within the IHSA because it discriminates between non-boundaried and boundaried schools. I'd be open to it in a NIPL context if it applied to all schools. Regular season record and enrollment are factors that ought to be heavily weighted relative to other factors.
The above is limited to an athletic association of private schools only. If you add all non-boundaried football playing public schools to that mix, there would be increased flexibility to expand the number of classes and/or the number of qualifiers in each class.
I would hope that public counterparts would be more open to non-con games so the playoff wouldn't just be a repeat of the regular season though. Thats one of the things I wouldnt like about a split.