I'm not worried about Notre Dame. If Taylor Kelly is completely healthy, Arizona State will beat Notre Dame.
As bad as the win looked against PSU, if Ohio State wins out they will be in the playoff. Finishing off the season with a possible Top 5 win vs MSU, a potential Top 25 win vs Minn (that loss to Illini killed this from being likely) and a possible Top 10 win vs Nebraska would help a lot. There tends to be around 4-6 one loss or less teams a year. Not many will even have the possibility of having two Top 10 wins in the final month.
The hardest part will be actually winning out. Everything else will play itself out.