The Ski-Doc Orbit is awesome and has become the gold standard slalom video tracking. Wakeye is also a very good product.
With either system, the problem is that they require a tight line to point the camera in the right direction. Even with a very tight line the tracker tends to point behind the skier at the ball as the rope gets shorter. If the skier has a little slack at the ball the problem gets worse. The standard solution is to keep the zoom pretty wide. The result is that it is just way better to have a human in the boat filming with a phone.
What if…. the system was designed so that when the rope is not pushing it the camera mechanically defaults to pointing out where the ball should be? If the line is somewhat slack the system wants to point the camera to the right or left instead of pointing at the last place the rope was tight. The result would be that the camera would track the skier with the line is tight and then go to the ball if tension is lost.
I admit I am struggling a little to describe the idea or think of a good analog. In the end the system can not be overly complicated.