One good game doesn't mean the Illini are "back." They've been putrid for seven weeks and regardless of how they're doing today, they won't be striking fear into the hearts of anybody the rest of the way. They've been especially bad on the road, which is where next week's game takes place.
Having said that, if they are playing well today, I would file it under the "it's about time" category, especially with the high expectations they had in Champaign at the beginning of the season.