But ESPN has more games to show... if we have 14 teams (15 with ND), there is a maximum of 15 games/weekend. With 3 time slots (noon, 3:30, 7/8), you can get at least 6 games on. Between the ESPN networks, I highly doubt that there are 6 games on any given weekend. I think you would still see some non-conference games on ESPN as well... it just may depend on who the opponent is. NBC could also set up USA with a game or 2 per weekend. Possibly the prime-time slot on Saturday's would go to USA...
If NBC is serious though, they have to broadcast online as well to compete with ESPN3.
NBC just "rebranded" their Live Olympics phone app to be NBC Sport Live. They will be showing live events/games on there this fall. This is the first step...