OTOH, it's difficult (impossible?) to un-allocate spectrum that has been put into use at any point. Perhaps there are foreseeable uses in the medium term that

OTOH, it's difficult (impossible?) to un-allocate spectrum that has been put into use at any point. Perhaps there are foreseeable uses in the medium term that we should be reserving spectrum for, rather than auctioning our future resources off to today's rent-seekers.