It’s a legit possibility that “FaceTime” in the future will be super low bandwidth because the phones on each end do local animations of a deepfaked/skinned model to match live capture rather than transmit high resolution video.
We can already compress video massively, enough to video call on crappy mobile connections without much care. I can’t imagine network connections would get worse in the future so it wouldn’t seem like there would be a need to compress further.