I have no frame of reference. But, it looks like Autzen fits roughly 54,000 fans, and given the amount of alumni/fans on the coast and the number of fans traveling, I would hope at least 5,000 get in there. Totally uneducated guess/opinion there.
I heard one Nebraska sports outlet suggest that most Nebraska games played on the west coast see 10-15K Husker fans. There was speculation that Autzen, even with a small stadium capacity (54K), could see similar numbers from Husker Nation. However, that was complete speculation but based on numbers from past games.
NO WAIT! 12!