In the past (typically, Les Miles’ teams) that’s exactly when they mailed it in. They placed so much emphasis on that game, would typically lose, and just come out flat the remaining 2-3 games.
I do agree with the rest of your statement, and it sounds nice and all, but it isn’t reality — especially now. Starting players transfer and coaches leave at the conclusion of the season, but before the bowl game. Players opt out. It just isn’t the same. Again, if you’re Vanderbilt, Minnesota, Northwestern, Cal, Oklahoma State, Pitt, Arizona State, Iowa State, etc…that’s different. You’re still playing and likely excited. The major programs, however? No way. There’s a reason for the opt outs and low fan turnout.