Not only has Sagetech already got impressive Mode-C/mode-S/1090ES out hardware that scales down to relatively small drones, but again to harp on TSO-C199... That provides a model for potentially getting some of this stuff in manned aircraft. That new TSO provides a path for manufacturers to build low-power Mode-S/1090ES devices that use non-TSO GPS sources, and not just "meets requirements of" GPS sources but stuff actually based on more consumer GPS technology. We could eventually see that in certified gliders and to interact fully with TCAS the 1090ES receivers and the ADS-B ground infrastructure. But I suspect if anything that TSO will actually morph into use in the UAV market. Which is great for TCAS and for glider pilots with direct compatibility with PowerFLARM 1090ES In. So I don't want to hype futures, and nothing at all may come from this that affect gliders....it is more just an interesting sign that non-Transponder UAT-Out only solutions are dead and buried. If you fly near airliners and fast jets, and maybe lots of GA traffic please do not put off considering installing a transponder because of future technology speculation.

Oh yes and FLARM was a direct inspiration for the FAA developing TSO-C199.... :-)