A large part of the body language component is reproducible today with hand trackers + head orientation. In terms of facial cues there have been some interesting demos with gaze tracking being reproduced onto the visual avatar.
but have we gotten past the uncanny valley yet? I've seen this attempted previously but it always seems very "off" in a way that engenders distrust. When we could just fix video streaming, it seems redundant to try to accurately replicate body language in a 3d avatar.