I don't think the problem is that console gamers wouldn't be interested in a game like Eternity or that console gamers and PC gamers are completely disjoint sets, but that it's not necessarily a game that most people would want to play on a console.
I do some console gaming and I do some PC gaming. I enjoy both. Would I be interested in playing a game like Eternity on a console? Not a chance! And while I realize that my preferences aren't necessarily representative of the community as a whole, I wouldn't be at all suprised to find out that there is not really much of a market for mouse + k