What we really need is just a blacklist of low frequencies for emergency coding and military use, while the rest are open. Intentional interference would still be illegal as it is now, because that is a disjoint law independent of whether spectrum is private or public.
How much of that productivity is derived from the fact that support costs are externalized? Devices having issues connecting to WiFi, network occasionally disappearing for no good reason, neighbor stepping on your WiFi channel, Roku or PlayStation frequently buffering when playing online video? Tough luck, Google is your friend.
Carriers do not have the luxury of enjoying such laissez-free relationship with paying customers.
That has not been my experience. Where I used to live, there was line of sight to multiple towers, presumably enough to get every carrier. Yet service was spotty at best. My monthly data usage was like 70MB or less, not because I dodn't want to use it, but because the 3G speeds were so slow (LTE was even slower and flakier). 30% of the time web pages wouldn't even finish loading.
And why did that happen? They probably figured it was worthless to auction given the attenuation. So if something nets minus dollars in your auction scheme but trillions of economic value, hey, I think we're still waiting for some data to come in on this thesis.