Ohio State has lost to Penn State, Michigan State, Purdue, and Iowa these last 10 years - arguably despite having a better team in every case. Losses happen, even to a despised rival. Despite wild success, even Saban has fallen vulnerable to a loss to Auburn once every 3 years. As much as it pains me to say it, TTUN pumps too much money into their program to not pose an occasional (let alone regular) challenge to OSU. 
If OSU gets upset at home next year, then yes, we have a problem. But it surprises me to see so many drawing larger concerns about this loss that exceed simple acknowledgment that TTUN was good this year and we had to send our youngest team in two full decades to their place.