I don't think that matters as much if NBC is also a participant in the B1G media deal, as I have heard tossed around. Top tier games will be on FOX, and NBC will get any Notre Dame home games that aren't on FOX, which will also help any of the lower tier B1G teams by giving them a national audience as well. It's still likely that ND will get at least 1 away game on BTN, but BTN usually only shows us playing against Akron or Indiana, when Indiana sucks, so it isn't like Us, scUM or the Pedsters will have all our games on BTN, while ND is shown nationally on NBC/FOX.
Also, there will still be a lot of ND specific stuff on BTN, like ND football classic, etc., which will help see the channel and give it more value.