What is the real use case for this?
Most current networks can handle video conferencing (relatively) well. However, if 8k video or something like Light Field displays ever catch on, then we might end up needing orders of magnitude more bandwidth to drive video conferencing, so this might be an enabling technology.
What about latency though? Would that improve?
I wonder whether the experience would be too undermined by artifacts from e.g. your coworker's cat, for which the system doesn't have a model, wanders into frame partway through a call, and suddenly the system must dynamically either (a) 'downgrade' to just video (b) be able to create a new model for an arbitrary new thing on the fly (c) create some hybrid of partial video data with part viewer-rendered animation or (d) your coworker looks crazy interacting with something the system hides from you entirely.
Acting in 3d recreation of your favorite movies. If you can scan faces you could play in rendered 3d recreations of movies.
Video games you could from a web cam image play a 3d avatar of yourself in a game.
Post fx tooling for movies. Cheaply touch up or add virtual extras to a scene.