We can see that Wonderscope has a similar problem that I had with project 1 and 2. Namely, real life objects that should be in front of the AR objects are not put in front. We can see briefly in the promotional video that the runway is laid directly on top of the father's foot. I unfortunately don't have an iOS device to test this myself. However, this leads me to believe, that the application's models will be rendered in front of anything that enters the frame.
Another problem with Wonderscope, is the length of these stories. Making these AR stories seems like it would be time consuming. They must write the story, animate the characters, and then voice act the characters. Wonderscope's stories are around 10 minutes. This is a good length, but if we compare this to normal book reading, there is not nearly as much content. Additionally, the time consuming nature of these stories may limit what and how much is shown. It is certainly harder to create these AR stories than it is to create a book. After these 10 minutes are over, the child is still on the tablet and may simply go right back to sitting on the couch as they play on it.