There were 3 generations on Xenon which powered Xbox360 (90nm (2005), 65nm (2007), 48nm (2010+))[1]. Modern processes are 28, 16/14 (10nm is Intel only really and Xenons were fabbed GlobalFoundry) [1]. The 2005 vs 2010 models reduced power consumption reduced power consumption from 177watts, to 88watts (under intensive gameplay) [2].
So realistically there are 2(ish) nodes available 28nm and 14/16nm [3]. Which could likely (best case scenario) halve power down to 50-40watts. Apple TV by comparison uses 1.8watts [4]. Passive cooling is possible, but the case foot print would be larger.
I'm not a thermodynamics guy.
[1] https://en.wikipedia.org/wiki/Xenon_(processor)
[2] http://www.anandtech.com/show/3774/welcome-to-valhalla-insid...
[3] 14nm/16nm are 28nm but a different gate style. Features are still 28nm. Also I'm assuming GlobalFoundry is calling their 45nm node 48nm because they called their 14nm node 16nm.
[4] http://www.flatpanelshd.com/review.php?subaction=showfull&id...
https://www.ifixit.com/Teardown/Apple+TV+4th+Generation+Tear...
https://www.apple.com/vn/environment/pdf/products/appletv/Ap...
Looks like about 0.2-0.3 watts in standby, a bit under 2.5 for content streaming. The power supply is spec'd at 11 watts.
For example, when your YouTube app crashes/hangs on the Xbox One, returning to the menu does nothing as the app pauses/runs in the background. You can hit the menu button (akin to a right-click) on the YouTube icon and select Quit. If you run YouTube again, it'll still be running and crashed. The trick is to menu button and quit YouTube and then run a couple other video apps (usually Netflix and Hulu do the trick). This is usually enough to fully offload the YouTube process and allow it to run again.
This is how Microsoft's flagship entertainment console works. In 2016. Seriously.
Everytime our cat sitter watches our place, I have the Xbox 360 hooked up for her to watch videos on. It's easier to use and more reliable.
Disclosure: I used to work on the Xbox Live team at MSFT but no longer do.
I had the YouTube app crash on my Xbox One just yesterday. I hit menu and selected quit. Waited a few seconds. Hit menu again and quit wasn't an available option which should mean that it's done being force quit. Started YouTube again and it will still hung playing audio with a frozen picture. Sometimes I'll start it again and it'll just show the YouTube logo for a few seconds then return to home. It'll often do this a few times in a row. I have maybe 6 people in my neighborhood with Xbox Ones that all experience the same issues.
On the other hand, if you don't hit quit, than hitting home and opening a bunch of other apps is exactly what you'd have to do to get the constrained (minimized) app to force quit while in the background.
I had the YouTube app crash on my Xbox One just yesterday. I hit menu and selected quit. Waited a few seconds. Hit menu again and quit wasn't an available option which should mean that it's done being force quit. Started YouTube again and it will still hung playing audio with a frozen picture. Sometimes I'll start it again and it'll just show the YouTube logo for a few seconds then return to home. It'll often do this a few times in a row. I have maybe 6 people in my neighborhood with Xbox Ones that all experience the same issues."
And it was just confirmed by another HN user.
They have actually backported quite a few games[0] to run on the Xbox One (where you can use the original disk, or now even buy them as digital downloads). So my guess is that they are likely to push for more Xbox One sales (where buyers have the convenience of playing either era of game) rather than try to create a mini-device that would only be able to play older games and not newer ones.
[0] - http://www.xbox.com/en-GB/xbox-one/backward-compatibility/av...