If having Bo at the helm has proved nothing else to us, it's proven that NO OFFENSE is impervious to a proper defensive scheme. The Spread was so much the next great thing on offense that half of Div1A went to it - and Bo promptly shut it down in nearly every game he played against it.
The Option was a hell of an offense, yet time after time after time we saw a team capable of shutting it down. The biggest flaw in the Option, as we saw demonstrated so well by Iowa in the Orange Bowl. For every offense you run there's a defense capable of shutting it down, just like for every defense you run there's an offense capable of exploiting it. Sometimes a team just out-executes a great offense.
Returning to an Option-based offense wouldn't solve any problem Nebraska has now, it would just be a return to what we're used to. Just like on defense, we need a system we can execute and the personnel to do it. Once we have those, it won't matter what system we use, we'll score.