We've seen many weird consoles this generation.... the Ouya, MOJO, among other android based home consoles. Most of these consoles are failing or being bought solely to be used as pirate machines.
This Alienware Alpha isn't going to change anything. PC gamers are already using their Xbox controllers with PC games, so that's not a selling point. Also, PC gamers would opt for a mouse & keyboard over a damn controller any day. Most PC gamers are already using steam, so they're not going to purchase a home console that lets them do the same thing they are already doing. Console gamers who are not familiar with PC gaming will probably ignore this console altogether or just not buy one due to the price point (which will inevitably be high).
Of course, this could be wishful thinking. I prefer physical copies over digital copies any day, and I don't care whether or not they throw in some stupid .pdf artbook.