no, No, NO!!
Stop this train before it gets away from us all.
Unless they are in touch with ALL the users, it really won't work. I'll admit that there are others wanting to grab the spectrum, but LEAVE IT ALONE.
My need comes from wireless Mic's, which in the USA are unlicensed part 15 devices. This is a different application since the operator of the unit controls BOTH ends of the channel. The "white space" grabbers have nodes that have a single "point of view" and while their "signal detectors" might detect some signals, they won't detect all parts (specifically the receiver) of the channel. This is the flaw in the use. Since they can't detect the receiver (even if it is a TV), they cannot say that the space is "unused". The receiving box (whatever it is) may have a nice directional antenna that picks up the signal, and then a more local "white space" thing comes along and blabs its heart out, which can/will be picked up by the receiver it can't detect. The non-"white space" user is then out of luck.
It is like trying to cross the street and only looking ONE WAY. You are sure to get run over!