For both teams, it will come down to coaching up.
My view is if you're relying on incoming freshmen or even redshirt freshmen to save you, you are in big trouble (look at the Gopher depth chart going into 2010.)
The Badgers lose their do everything WR Abbrederis and their top TE Pederson. Nick Toon was the top receiver when Abbrederis was starting to shine as a red-shirt freshman. Hendricks was the star that year as well with Pederson making a little noise. There really was something to build on. This time around, Wisconsin is starting from scratch with none of their receivers or tight ends having yet stepped forward. Also, as stated, they lose their top receiver out of the back field, James White. The Badgers have no "up and coming guy" this time around. I think Gary Anderson is a good coach so he can turn things around. But I have always felt that Bielema "got out of Dodge" knowing a bit of re-building was going to have to occur eventually.
The Gophers lose Engel. That is it. The numbers aren't spectacular, but unlike the Badgers, numbers actually exist. Neither team has a Drew Breese or Russell Wilson to make their receivers look good. Both teams need someone to step forward. Who that is when it comes to receiver is a crap shoot. The Gophers have not had a top wide receiver who wasn't either a 2* recruit or a walk-on since before Decker and Abbrederis was a walk-on for Wisconsin. So, guessing it's the guy with the highest Rival ranking is little bit of dreaming.
I would say that the only star receiver on either team is the Gopher's tight end Maxx Williams. (We may have Berkley Edwards coming up, but like I said before, I disqualify all red shirts and true freshmen when predicting.)
In closing, I wouldn't bet a dollar on this bet. It will come down to the coaching staffs ability to "put their players in position to succeed". Besides Maxx, it's in the hands of the coaches to deal with what recruiting and fate have dealt them.