If they can somehow get 2/3 of OSU, Clemson, USC watch out. I see 1-2 as the most likely outcome there (though 0-3 is more likely than 3-0 in my opinion) so it comes down to not slipping up one more time.
Draft Kings currently has the number right at 9 for what its worth.
The problem I would have as an ND fan in the current playoff format and their lack of conference affiliation is that anything less than 11 will feel empty because they have no conference championship game, will likely miss out on the four team playoff with more than 1 loss and will play in what is now a meaningless bowl game where most talented players will opt out.
Its playoff or bust in the current format.