Might there be some seating minimum for a regional? I assume that is what you (and Heather) were referring to?
There is a minimum seating requirement. The Field House at full "capacity" easily meets that requirement, but can they actually put 4,000 people in there any more?
There are also requirements about things like locker room facilities and camera positions, as well as a requirement that an arena have a system in place that meets the NCAA's requirements for instant replay calls. Again, I have no idea if the Field House as it is currently constituted meets those requirements or not.