Blu Ray Player (that I never use), check. Plex client, check. DLNA client, check. Digital Optical Out, check. Netflix, Amazon Video check. Gaming machine, yup.
It completely removes the need for a HTPC.
The WAF of using a controller to control video playback is low. We have a Roku 3 and it's far simpler to use than our 360 or PS4. Plus it's never "off". Side benefit is that I can remote play the PS4 when someone is using the Roku ;-).
The Switch could plausibly fill this gap, but I guarantee that those little controller thingies are going to get lost.
EDIT: Interesting, this http://www.udoo.org/udoo-x86/ could definitely power a PC running PS Now. So, I can't lug a PS4 around, but I could lug a PS3 around :) And it would just so happen to have access to the entire library of older systems. Thanks for the idea. I know what my next weekend project will be!