I think 8-4 should be the absolute lowest expectation for regular season wins and losses, I think 9-3 is the most likely, and I think Husker faithful can talk themselves into 10 wins. The west is winnable this year if guys stay healthy. The only real question mark is in the backfield, but the way Frost wants to run his offense, that isn't as crucial as it would be for a run-first / traditional pro-style offense.
I think the defense will be much improved.
I think the next 5 years should be a straight climb up from where they were the first half of last year, to getting in the mix at the 2nd tier of national powers again. There won't be a return to the mid-90's and complete dominance, but they can reach and maintain a higher level than Michigan State, in my opinion.