It's moronic greed
Terrestrial TV has given up to much spectrum already.
Greed by regulators thinking of increased license fees
There has been a huge increase in allocation to Mobile Spectrum above 900MHz too.
They are not building enough base stations (adds capacity via frequency re-use and up to x20 higher speed due to half distance is about x4 speed). Spectrum is being used inefficiently. If there was a single physical provider and ALL mobile networks where virtual, that would more than double average speed/capacity overnight. The Regulators/Governments oppose this on spurious competition grounds, but the real reason is that their licence income would be 1/4. Licences should be performance based on meeting KPI and then revenue from use. Not up front sales to highest bidders after chopping up the spectrum. Some people "sit" on spectrum for years.
The regulators want to kill terrestrial TV and have only Cable & Satellite broadcast, or Mobile operators selling Broadcast version of LTE. Certainly Ofcom and Comreg have already decided this is policy, without any consultation.