What about when the ball bounces, or otherwise changes direction suddenly? It would be very hard to watch. But you wouldn't want to make the ball's POV the actual real-time feed anyway, you'd totally lose the context of the game. This technology would only be useful for replays.

Perhaps another approach would be to have a bunch of cameras around the stadium, motion-track the ball in 3d, then stitch the ball's POV together using a process sort of like Google street view, or that dumb 3d revolving-subject thing that was in all the commercials five years ago. Then you could calculate a 'line of best fit' for the ball's trajectory and render video 'just-in-time' for a quick, smooth replay.