Penn State came into the Big Televen thinking they would win regularly, and have yet to win the Conference, though they have been competitive. I would expect Nebraska to be competitive, but that doesn't necessarily mean they can win the Big Tenwelve. On the other hand, they will leave a vacuum in the Big Twelveten North, and it will be interesting to see if Missouri begins to dominate it.
Penn State won the Big 10 in 2005 and 2008. Although they tied Ohio State, they finished higher in the polls and represented the Big 10 in their BCS games in those years.
I do agree with your point though that it may be harder for Nebraska than everybody expects. But i still think they'll win the Big 10 next year.