Difficult to predict
If they are going up against consoles, I can't see this taking off. Console owners like the ease of use from a console.
On the other hand if they are wanting to attract Steam users - the people who will actually have heard of it - these people are generally PC gamers and PC gamers are normally PC gamers because they prefer playing games on a PC.
The niches of nerdy console gamer or PC gamer who wants to play on their TV seem pretty small to me... if they're not going to market this in a big way to compete with MS/Sony it's a bit hard to see it taking off.
Question: since it's basically a Linux PC does this mean it will support Netflix and all those things and/or some sort of app-store, so it can be used as home entertainment hub in the same way as a PS3/4?