Steam Machines Streaming

So I've been following the whole "Steam Machines" story as of late, and I think it's looking good (but maybe a tad shaky) for Valve. Only thing is, I have a great PC that I already use for gaming, and I don't wanna purchase a 500$ box for downstairs. However, I also want to play on my TV with controllers without bringing my box downstairs.

I'm wondering, do you guys think that Steam will make some sort of Chomecast-like device? I'd love to have a simple stream-only device to connect to my TV so I can play games in the living room without another computer. Is a device like that feasible and do you think Valve will look into something like it?