Not really; The only thing making this hard to do with VR today is a lack of means to capture the HMD wearer's face, because there's stuff in the way and needin

Not really; The only thing making this hard to do with VR today is a lack of means to capture the HMD wearer's face, because there's stuff in the way and needing to have a dedicated/stationary camera pointed at your face while you're in VR is just impractical. Future headsets might start to implement some Leap-esque sensors pointed at the user's chin and some eye tracking cameras inside the headset to address this eventually, but that's going to be prohibitively costly for some time (not just in terms of dollars, but in added weight/heat as well).