I really think the open carry aspect of this is going to provoke a backlash. Yes, very, very few students are going to be so incredibly stupid as to open carry to class. Do you suppose that might influence how some professors might grade you essays? It should not, of course, but for a fair number of faculty, seeing anyone carrying openly on campus will be an underwear changing experience.
I really hope that some sort of reasonable compromise gets worked out--something that lets Idaho academics pretend that, in spite of the law, there are no guns on campus. "Don't frighten the horses and servants" is the operative idea on this.