Probably not 5 spots - I think a max of 4. Ole Miss will probably jump them based on their win over #12 Georgia. Georgia may not drop behind NU, given that we often see SEC teams shown more forgiveness for their losses. MSU might not drop behind NU, either. If that's the case, NU might only move up 3 spots.
Had NU not been so sloppy and won by a more comfortable margin, they'd have a stronger case for moving up to 15. But then again, the polls have never been known for their logic.
Bottom line is that NU has 3 very winnable games over the next 4 weeks. Take care of business over the next month and NU could be knocking on the door of the Top 10 by the time the Wisconsin game rolls around.