This opens up all the platforms depending on how they play the streaming thing. If they make this work well and release client apps on the mobile side, suddenly Steam has a domination of the whole home on a level that Microsoft has been playing at for years.
Old Way) I have to spend all the money for equally good hardware. I also need a copy of Windows.
New Way) Just get something that can render YouTube videos well. I now have a second Gaming PC. No copy of Windows!