Not clear what your concerns are. These devices are supposed to "check in" to a database of Broadcast stations, Low power UHF repeaters, etc. to determine channels that can be used, as they are also supposed to have geolocation included. If your mics are licensed, then I believe you can add them to the database.

There is also a provision for spectrum sensing to detect wireless mics, but the testing so far on spectrum sensing is less reliable.

The "White Spaces" plan is to use unused UHF TV Bands for wireless internet. There's plenty of spectrum in rural areas, not so much in populated areas.

This is separate from the 700 MHz Auction from last year