Valve is clearly using games as a wedge, the Steam Machine is (and will continue to be) pushed as a capable general purpose computing device, and as the Linux desktop experience improves they will lean harder into that angle, until they're selling sexy general purpose devices with a user experience comparable to Apple's. This includes phones, though the timeline for that will lag a few years.

Outside of speculation do you have any source or evidence that valve plans to expand the hardware ecosystem outside of gaming?