Impresive initiative indeed but unless it can be configured to pick up all the rest of the aircraft transponder squawking with non-ADSB Mode S, Mode C and also Mode A, which makes up the majority of GA aircraft, I can't see how it is a way forward.
A step in the right direction would be the ability to see Flarm traffic, but until/unless Flarm stops encrypting their data, this will not be possible. Sign up to this petition to encourage Flarm to change their policy.
https://www.change.org/p/mr-urs-roth...ail_responsive
BobD