Auto landing airliners is done via airport radio beacons. It’s a solved problem, and nobody is interested in GPS type nav for it.
There's actually quite a lot of interest, at least in the US. Maintaining all those radio beacons is expensive and they're seeing increased failure rates as the equipment ages. ILS will probably be the last to go, but we're already seeing experiments with using GPS instead of VOR beacons, allowing more direct flight paths.