I don’t think its realistic to think we could have a perfect system at tracking aircraft as anything you put on the aircraft could be defeated and a worldwide radar system on the ground is just not feasible as the oceans are massive and politics would probably prohibit it from getting very far

I do think it will be become easier to actively track aircraft as technology is adopted. Aircraft that have high speed internet connectivity through a satellite system typically have a inertial reference and GPS signal so that the antenna can properly point and track a geosynchronous satellite while moving. This data could easily be transmitted over the same communications system and be used for tracking and recovery operations.