FWIIW, I think that except for limited enumerated locations (e.g., detention facilities & courthouses) ALL State and local buildings and facilities should be treated the same as a public street.
I also think that in those enumerated locations they should be required to provide a place to check/secure your gun at the door -- as NH does at their courthouses. No need to go unarmed to go there, disarm in your car, etc -- just be unarmed when in the facility.
Now, as for private owned colleges, facilities, hospitals, businesses, etc, I think we need to balance their rights against the individual's RKBA. A good balance would be that they should require a clear prescribed posting at all points of entry and be required to carry/assume specific liability for any injury or death on their premises resulting from a criminal act. If someone (employee, student, patient, visitor, etc) is disarmed by their policy they should be responsible for that persons safety while in their "unarmed victim zone."
Maybe some day
Don't be stopped by "It will never be." Keep asking "Why not."