This isn't about throwing away radar, it's about augmenting the current system with more accurate data for better and safer management of airspace. Existing no

This isn't about throwing away radar, it's about augmenting the current system with more accurate data for better and safer management of airspace. Existing non-ADS-B based traffic management requires accurate altimeters and working transponders; we have always been at the mercy of systems that can fail. One of the many reasons for the substantial training of pilots.