I have been following this tread with great interest. It's good to see new developments and other ways to enjoy the hobby. I don't think you can compare it with the analog lane changing systems that were for sale in the 70's and 80's, f.e. Carrera Servo. The big difference is that with the Servo system you could change lanes at any place on the track, not at certain points only. Even the current digital system don't offer this possibility.
However, a car following an, invisible, metal line in the track is not really new. The Faller Car system uses more or less the same idea, also using a magnet in front of the car to stay on track. Of course the Faller system is not meant for racing and the cars (truck and busses mostly) run around independently (more or less, I don't know all the option you can get nowadays) since is was used as an addition to the scenery for a rail road track. So Mag racing can not be seen as something completely new but more as an evaluation from systems already on the market giving the opportunity to actually race the cars against each other. I do wonder if this system is not breaking any patents owned by Faller
Here a small video, regretfully the comment is in German but still it give a good insight in the system:
Faller Car System
However, a car following an, invisible, metal line in the track is not really new. The Faller Car system uses more or less the same idea, also using a magnet in front of the car to stay on track. Of course the Faller system is not meant for racing and the cars (truck and busses mostly) run around independently (more or less, I don't know all the option you can get nowadays) since is was used as an addition to the scenery for a rail road track. So Mag racing can not be seen as something completely new but more as an evaluation from systems already on the market giving the opportunity to actually race the cars against each other. I do wonder if this system is not breaking any patents owned by Faller

Here a small video, regretfully the comment is in German but still it give a good insight in the system:
Faller Car System