There is a solution to this - ADSB-in and ADSB-out in a ubiquitous manner. Just make it affordable, please, and reliable (backup systems available, perhaps augmented by 3G/4G networks - a GPS fix from a mobile phone/table transmitted out via 3G/4G is better than nothing).
I have said this before - we are apparently the "innovation nation" but everybody wants to fly without a radio with no broadcasts and use their eyes only.
This aint rocket science - it's basic 21st century comms, GPS and a bit of foresight in figuring out potential issues/degradation cases.