Great article! I never got the chance to visit DisneyQuest myself, but I've seen similarities with the problems Innoventions has had in EPCOT. Technology is a moving target - a state-of-the-art attraction only has a year or two before it becomes outdated! I wonder if the DisneyQuest idea might have worked better had it, focused on excellent games based on current technology, instead of trying to wow people with the cutting edge.
Your comparison to MagicBands is quite the stretch, in my opinion. I enjoy the simplicity of the bands - it keeps me focused on having fun in the parks, instead of fumbling with my phone every time I want to ride an attraction or have a meal. A MagicBand is evidence you've done something special, in a way no phone app ever could. Besides, as you emphasized, technology changes awfully quickly! Not everyone has a high-tech phone, you'd have to pour money into developing new apps every time a new operating system or phone/watch style came out. Better to have a simple, special, streamlined experience with Disney's proprietary tech!