That makes sense and is fascinating to consider.
Another point against it though is that it's still not cheap or easy to create a new experience, just cheaper. Look at Star Tours, that was meant to have the same gimmick, but it ran for decades without the addition of a new adventure, and even when it finally did they still only update it very infrequently. Credit to Mack they do add new VR experiences every few years. But it does add the logistical question; if like Alpen Express you could chose your own adventure would their be a risk of cars colliding unless they stuck to a mostly fixed path anyway? This prohibits them changing modes through the day without briefly closing the ride.