Re: So last year
I think the concept of having a PC be a dedicated entertainment is something that it's new, but as you mention hasn't received wide acceptance.
Now, with the use of boxes like Roku and Apple TV (along with Netflix being available in a wide range of devices) I think the trend is picking up speed. So for Microsoft to make it part of it's business strategy is a welcome, since in the past it was considered more of a feature than a highlight.
I myself am using a dedicated PC with Windows 10 for my kids, and they absolutlely love it, mainly because of the flexibility of being able to watch cable, there own media and youtube with great ease..