regardless of how small they make it. they have to block out all the external light so it will always be goggles not glasses and if people knows your glasses have a screen they will never trust your giving them 100% of your attention. so it will always feel isolated.
I think the biggest flaw with this wear VR 24/7 is computing works best when you share it with others. People want to share with people in the real world. I would rather see your real face than a video game character no matter how good it looks.