expanded playoffs work just fine. Even in the pros there are almost always some divisions that are much stronger than others in a given year.
Your point about the networks and major conference leaders is a fair one, but it also emphasizes the insanity of FBS football to which far too many of us have become normalized.
We've tolerated a system that is being run and controlled by people who are completely disconnected from basic sporting interests, and only want what slants the table even further in their favor over time.
College football is a very sick and troubled sport, precisely because the "blue bloods" and networks get everything they want and the rest of us have to make due.