Real-time databases = real-time costs
I suspect that these geo-location awareness and frequency information aggregation systems will cost to operate, and hence wind up costing the end users. Is this expected to be deployed in the home? If we move completely to an all white-space wireless society, including at home -- as I doubt we'll retire the ISM bands, this probably isn't likely -- that means you pay for the privilege to operate a wireless network anywhere, whether home or business. As well, it means a central database of all wireless devices which has the potential to defy privacy.
Thought it doesn't necessarily have to be centralized. A white-space awareness infrastructure could be built consisting of many databases coordinating amongst each other, possibly by region, and querying the back-end list of frequency assignments from the FCC or OFCOM. Wireless devices vendors could maintain a list of servers which provide mapping, published by HTTP/S or DNS, for devices to coordinate. Given the right amount of openness, enterprises or even home users could run their own white-space awareness (WSA) server(s) and configure the devices to query those in favor of the vendor-supplied list.
Some kind of simple caching could be involved at the device and WSA interface to allow for connectivity and service disruptions.
Paris, defying privacy for years.