Open carry on the grounds of a state university campus is ... risky.
We know that it has been tolerated a couple of times, with notice, as an exercise of First Amendment rights. What the reaction would be to an improptu open carry is unknown.
Then there is the practical issue: Where are going to go? If you violate the signage of a government building, posted pursuant to R.C. 2923.1212, there is a strong likelihood that you could be successfully prosecuted for Criminal Trespass, and you know the university is going to pursue that one.
Also note that it doesn't do much good for the underclassmen, who are less than 21 years of age and cannot purchase a handgun. Given the current state of the law, the practical applications of open carry on a state university campus are rather limited.