I'll bite. So, how long ago was that? It would be hard to convince me that, during the past several conference expansions, not a single conference was willing to take the Irish. They are presently not in a conference for one simple reason: they don't want to be.
Why would Notre Dame want to split their money with 9, 11, or 13 other people?
(So many fans on this board keep THINKING college football is about something other than what it actually is - money.
Notre Dame would lose money if joining a conference, because they'd lose the NBC deal and they'd have to split bowl revenue, etc.
Actually, they are currently in a conference: of one, and are essentially the 6th P5 conference. They don't have to share any of that NBC money, don't have a conference championship game, and schedule as they wish. While The Committee can't force them join a conference, they do have the ability to punish them for electing not to do so - whether or not they have the intestinal fortitude to do that is another issue.
The committee isn't going to "exclude" one of the biggest draws (still) in CFB when it means more money in those big games for other teams.
The funny thing is this: it's the echo chamber of FANS who keep arguing "they should join a conference."
Unless "winning your conference" becomes a REQUIREMENT (which most Bama fans don't want btw), there is no reason for them to join one.
(How is it so many folks cannot see the contradiction between those two statements?)
Notre Dame played a tougher schedule than Clemson did.
Notre Dame went undefeated against that schedule.
Notre Dame was NOT one of the four best teams in college football.
But they were also not undeserving of the game, either.
If Georgia wants in the playoff, don't get blown out by an LSU team having trouble with UCF.
If Ohio St wants in, don't get blown out by Purdue.