Depends. What can you PS4 do? Do you have to pay to make it a plex client? Chromecast to? Can you run vlc on it? Can it transcode? Can you run an opensource game on it? Run a decent browser on it? Steam? How about the collection of Classic Atari games?

I've only have public knowledge of the Atari, but X86, cheap, and linux does open some rather interesting possibilities.

I've yet to see a media player that does it better than Roku. If the Atari could be the roku of gaming it could be quite interesting, even if it doesn't have the latest/greatest $50-$100 game that the PS4 of Xbox has.

I am totally not interested in what PS4 or Xbox has to offer and will probably get one only when the prospect of porting one of my games to those consoles will be good enough to justify it (and that'll need them in some devkit form probably anyway).

On the other hand, I'm eagerly looking for more details about Ataribox. I only have a laptop(s) with Intel GPUs and I'm more and more in need of some device with stronger GPU with dedicated VRAM (mostly for testing, but occasional gaming with higher FPS would be nice too). I'm not keen on updating the laptop, as GPU is pretty much the only thing that would need to be replaced (and with Intel's worry-free open drivers stack, I actually like to have it on my main computer). I thought about building some cheap desktop just for those needs, but if Ataribox keeps on its promise of being so open, it might be just right (and cheaper) option for me.

Atari emulator would then be just a nice bonus.