With a high end gaming PC, a gaming laptop, all the current consoles, and a paid for PS4 on the way I couldn't care less about a steam box. If I want to play PC games on my PC I can just buy an...HDMI cable. If anything they need to work on a competent device that allows you to stream your PC library to TVs or something similar.
Also, a large majority of past, current, and even future releases are on Linux so a Steambox would be small potatoes for a long time.
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