College offenses are evolving into spreads, The more athletes on the field the better.
That too is a big part of it. We have been recruiting cornerbacks like crazy lately--far more than we need to fill the hole we have there.
I saw a stat where last year only like 1% of the offensive plays used a two-back set. I don't know if it was correct, but it wouldn't surprise me.
Pretty much all the south teams run a ton of 1 back or 1 back exclusively. In the north, ISU ran a lot of SHotgun with Meyer, the type of qb's hawkins is recruiting leads me to believe that he will air it out more, ku has gone spread, mizzou, as well, and NU has the capability even though they ran the ball a ton last year.