Eventually we will get past the novelty of mixed reality. You will just put on your smart glasses in the morning (or not), the way you now slip your smart phone in your pocket in the morning (or not). It won’t be something you particularly think about.
But it will mean that things that we can’t do now will become possible. In one fun example, we will be able to build and play with 3D puzzles that couldn’t exist in the physical world.
I’ve begun working on designing these sorts of puzzles on my mixed reality headset. I will let you know if I come up with anything really good.