I think USC winning and UNC winning is the most interesting scenario.
There would be a lot of outrage if Ohio State gets in, and calls that the system is rigged in favor of the blue bloods.
Lets be honest here -- Ohio State has played an incredibly easy schedule. They played two tough games all year -- they killed Michigan and got destroyed by Mich State (don't let that last second FG stuff sway you -- MSU was playing with a backup QB on the road and both of Ohio States scores game off of turnovers, one being a muffed punt at the 3 yard line. If not for those plays Ohio State might have legitimately gotten shut out, they did NOTHING on offense against MSU, and had Cook played it might have been a blood bath.)
UNC has played a schedule soft as charmin but it's not like OSU has a great resume. A lot of the Ohio State love is love for the brand and love for what last years team did -- and when people saw Ohio State plow over Michigan it reminded them of what Ohio State did last year.