Maybe I'm just bored, but I'm quite excited about what we will have to create as interface patterns with mixed reality. Even if there were no useful content made for it, I'm pretty sure I could spend hours trying building interfaces and see how well they go, just like I can spend hours trying to 3d print a ball or testing the limits of printing on thin air.

In any way, I can't see this not being a technological advance once we'll have played with it as makers for a decent amount of years.