13 of the 14 SEC schools are public. Ten of the 12 PAC 12 schools are public. All but one Big Ten schools are public. The ACC has maybe three private schools. The Big 12 has several. So public schools in the Power 5 far outnumber private schools. But that has nothing to do with USC and the decisions we make internally.
ACC has five, and along with the others you mentioned in those leagues, rarely does any of those private schools have success in their respective leagues, and certainly not any kind of success that is going to get them into the playoff picture, and most of them are content with that scenario
And I keep disagreeing with you over USC, as I said, and not personally, you are living in the past, nostalgia is fun, but not realistic looking at the current college football landscape and the cost to be competitive with the top six or seven