There is a world, because when the displays are high quality and they're thinner and lighter, they're going to replace phones, and almost everyone will be wearing them.
I think that since the input modalities are (seemingly) restricted to eye movement and sound, that it is impractical to replace a phone, where someone can engage privately.
It doesn't matter how high quality, convenient, or light they are, as long as wearing glasses isn't inherently cool, normal people aren't going to choose to wear them.
Nah, I don't see it. They've been trying to make smart glasses a thing for over a decade and it's not working. Nobody wants them. I don't think it's necessarily a privacy thing, it's just that smart glasses don't solve a real problem. Same with VR.