I don't know how it turned out, but a friend of mine was talking about running a DC power loop round his house alongside the AC one. The idea was that he could pull 5-12v lines off that for powering things like motion sensors, or even tablets being used as control panels, rather than having the house scattered with USB wall warts.
I'm not sure. Though I see a whole lot of chatter from chip makers trying to sell solutions into that market. Sounds like they have figured out you can run lighting and and other IoT stuff off it.
If you think about it most current IoT stuff blows. You need power for the device. And then you're using shit like WiFi for data. And even worse shit like Bluetooth for configuration. Security is a big big problem because it's brittle and conflicts with consumers need for stuff to just work. PoE solves all of those issues.
