I could put humidity sensors in my beer-hat, and it could tell me when to stop drinking so much booze.
Well, you're leaning to the "computer can do it for myself" track. That's something i can't buy and quite a dangerous trend that get some hypes here and there.
Don't misunderstand me, they are things computer are good at (better than people), and things computer are just not suitable for (or shouldn't be used for).
If this stuff is just used to help people being even more lazy and behaves on "autopilot" like getting messages such as "Stop drinking so much booze", "it's time to go to bed", "you've been sit too much, go take a walk" (that's about what you propose). Well i'm definitely not for it. I once had a mum and dad looking up for such things, but i'm now past age. My remark is about having people acting adult and having responsible behavior. You are NO SHEEP.
If this is about improving the way computer behaves with people (Alt+Enter is not what your grandpa thinks about when looking at the holiday video you posted), in a way which means "keyboard and mouse are outdated, let's see how we can extend", well, that can be interesting (and more natural by the way : you don't need a keyboard or a mouse to communicate with real persons, after all. So, if we can avoid it with computer...).