Hardware we could have built for the last 10 years, and really unobtrusive. You'd need better UI and software than with video, since information needs to be more closely tailored for a lower bitrate channel, but I think Google (or a smart startup) could do it.
99% of the reasons I use video are because I need to do the filtering and postprocessing in my head. If I had complete trust in a great software agent, I could just let it tell me what to do, vs. showing me enough data to make a decision. e.g. for driving, you can give directions by voice (if you're a talented codriver) which do NOT require any visual information to the driver during a high-speed rally. Almost no car nav systems are that smart, but if Google can build a self-driving car, they should be able to make an awesome codriver/navigator.
Extends to almost anything. I don't need to see a picture of someone and a dossier; just remind me of the most critical facts as needed, by voice.
This should be just as good as having a clone of yourself, or an entire team of ops people, watching/listening to what you do, and giving you voice prompts, just like a video game, or being the President on TV in a live debate, or whatever.
The hardware is trivial; it's all software and back-end processing, which Apple sucks at and Google/Amazon/Startup should rock at.