ADS-B is a safety enhancement; the entire world uses a different frequency than the unique low level US frequency; why did the US go a different way?
Satellite ADS-B is the way to go; wait a bit, and as another comment says; the US will go that way as well.
Yes; the mandate will cost me money, but having traffic in the cockpit, and seeing other traffic is priceless; decades in a jet cockpit with actual saves makes it very real!