I have a PS4, and I think that saying that a console being an all in one entertainment system is *not desirable* is missing the point, the consoles should have some media playing capabilities, at the very least like the previous machines did, they should also offer apps, more mredia/whatever apps the better.
RIGHT NOW, this is true as long as it does not compromise the main feature of the machine and it does not make it more expensive, at least not significantly. Because you have cheap Roku boxes, people who watch TV a lot have their cable box too, many of the same features/apps are already on a lot of smart TVs as well... so it's not like the console brought something new and shiny in your life, even if the netflix app is smoother on it or browsing the dlna servers has better transitions than your previous solution.
It was very different when the PS2/3 and the 360 were released, for the PS2, DVD was a killer feature, they were not that common back in 2000! and the HD media playback, streaming capabilities of the ps360 were interesting for many people, the DB drive in the PS3 sold quite a few systems to non gamers, or light gamers that would have passed or gotten another system... Why was it different, back then the streaming features were not in most TVs and you could not buy a 35$ chromecast to stream your media, also, DVD players were quite expensive, so bundling it with the PS2 made it attractive and justified the purchase, same thing for the blue ray drive in the PS3....
The XB1 seems to have a better integration with Cable of all things, and there is some way to read your movies on it I think... however, this feature is expected now, it does not get people excited anymore... it's more like, people wonder why that was not in day one on these consoles, whoever did not think of at least providing a basic streaming app on both of them seem to have forgotten something basic... but hey, they don't read audio CDs either :-/
