Absolutely agree. This has been tried before, as has already been noted here, and it never took off.
It won't now either because people do like to show off, but on their own terms. They post their lives on Facebook because when they're not on the computer, it does not affect them. This is invasive and forces them to be their show-off selves when they're not ready.
You can take a phone call when you're naked, no problem. With this, you're liable to get a bad surprise when you answer and find that your wife is looking at you wondering why the hell you're in the nude at 3 in the afternoon.