Nate Silver is pretty bearish on the Irish getting into the playoffs. At present, the Irish have the second best odds to make it at 77%, which seems low for an undefeated P5 team. Additionally, if the favorites win next week (Bama, Clemson, OSU, and Oklahoma), the odds look like this:
Alabama: >99%
Clemson: >99%
ND: 62%
OSU: 69% (nice)
OU: 69% (nice)
Of course, these are modeled off of past committee decisions and therefore should be taken with a huge grain of salt. Intuitively, an undefeated ND should not be left out of the playoffs. But...given the way the committee's discussed ND's standing the past few weeks (grouped with UM and UGA instead of with Clemson and Bama), I'm not closing the door on some complete BS just yet.
Link:
https://projects.fivethirtyeight.com/2018-college-football-predictions/