It doesn't matter what type of offense that Nebraska runs...they still aren't going to get a second look from top QB recruits.
First of all...Nebraska doesn't get enough national TV coverage to support the egos of most of the "top" QB recruits. Think they're going to come to NU to play for local media coverage? Doubt it when they can go to USC or Ohio State to play on National TV every Saturday.
Second...history shows that the NFL just doesn't come sniffing around Nebraska when they're looking for a starting QB. Which of Nebraska's past QB's have ever gone on to the NFL to meet with great success? Tagge? Humm? Fraizer? Crouch? Only one I know of was Vince F and he happened to be in the right place at the right time for a great team...all the others either ended up holding a clipboard on the sideline or watching the games from home. What top QB would want to follow in the lines of that?
Then you have the other factors to throw in there...weather (why would a precious five-star want to take a chance of jamming a toe on frozen turf when he could be playing in California or Florida), academics (FSU sounds like a place for a great athlete with marginal thinking skills to attend rather than NU), friends and family support ("Texas promised to fly my grandma in for all the home games!") etc, etc, etc....
Run any type of offense you want but run the one that works best and allows you to win. If that means a FB plunge up the middle for 3 yards every damn play...so be it! Find a QB who you think will work with YOUR system and don't worry about running an offense because it gives your players a better shot at the NFL...who cares what they think anyway? Didn't they give us that HCing genius Callahan?