I think the killer app will be online meetings. Online socializing really.

I work fully remote and Zoom/Meet works fine for meetings. But I kinda dread things like team happy hour and find you have to keep them structured like a meeting to work with group video calls.

Visuals aren't even the key factor here. It's audio. I find the obstacle to casual socializing is not being able to directionally focus audio so overlapping conversations are possible.