Leadsled, you should come clean on this subject. You only prefer UAT because of the datalink. From an ATM point of view 1090ES is superior. 1090ES operates outside ground station coverage in real time with SSR and TCAS. UAT, by virtue of the datalink must be within range of a ground station. A Mode S transponder still must be carried because UAT is invisible to SSR and, more importantly, TCAS.
Your preferred position is and always has been no form of surveillance for GA PVT VFR!
Australia will never suffer from FRUIT, old fruit
The technology burden is most definitely bourn by the aircraft owner, no doubt!
However, that technology burden can be as simple as a blind GPS unit feeding a compatible mode S, 1090ES transponder.
What is concerning, is the very real holes in coverage adjacent to the J curve SSR envelope.