Introducing a new wireless protocol is incredibly difficult. You basically have to have all the countries in the world to give you a chunk of their spectrum.
You have 2 mainstream protocols now, one for low energy, slow data transfers (Bluetooth) and one for fast, but more power hungry devices.
And as far as I know, Wi-Fi and Bluetooth didn't have frequency given to them. They instead used frequencies that were already available for unlicensed use.
You have 2 mainstream protocols now, one for low energy, slow data transfers (Bluetooth) and one for fast, but more power hungry devices.
I don't see the usecase for UWB.