Communication is key and understanding chemistry. Knowing how each person works best. Hard to optimally do that if you don’t look at someone in the eye.
(2) leading to (3) basically due to (1)
I bet that within 10 years we'll see a tool that 10x's the current Skype/Hangout/zoom (ffs!) experience
Holography?
Or maybe just HD audio & video that simply works...?
Even simple audio calls went down since phone calls were a thing...