I do believe if the double teaming had been defended more effectively then they certainly wouldn't have near the success against NU. The big runs came when double teams interfered with the linebackers. They didn't have a lot of success when they did not use combination blocks. This is a case where one specific break down in technique amplified the results.
The double-teams are part of a zone blocking scheme, which is also what Nebraska's O-line uses. It's designed to get double-teams wherever possible and shove the D-lineman to the 2nd level to then slide off and pick up a LB. The double-teams were effective not just because of some magical play-calling or complicated scheme; it was effective because these are really good, big, strong linemen with a lot of years of experience, and they were shoving around mostly under-sized, young, inexperienced D-linemen on the Nebraska side who don't have the techniques or reads mastered yet. Wisconsin's O-line was pretty much a carbon copy of Nebraska's O-line from the 80s and 90s, right down to their scheme, technique, age, and multiple years of training before being able to contribute.
We need time, good bodies, coachable kids, more strength and conditioning, more coaching/drilling of techniques and making reads,... and more time. It takes 3-4 years to build an O-lineman, and you need 3-deep depth across the board, both for cycling guys through, and for emergencies. It's pretty much the same on the defensive side. When we switched from the 4-3 to the Diaco 3-4 to this attacking 3-4, it was like starting over, 2x. While the coaches and players might mean it when they say that this wasn't Year 0, it was definitely Year 0 for the entire D-line and for any of the O-line that didn't get most of the reps last year.
Patience. Patience. Patience.