I disagree on that. The 4-team playoff has "diminished" the regular season; the question is whether that diminution is a good, bad, or neutral. Every season's different, but generally under the previous regime, for OSU to be confident in a shot at the national title, they'd better not lose a game in the regular season. Now they can generally lose one and they're still good. There is a lessening of importance of regular season games in that, but you can reasonably argue that that's a good thing. You can further reasonably argue that it's only good so long as it isn't taken too far, as I think you do.