You know, There's definitely issues with this, and I think there is a market for it, but I agree he's going about it all wrong. 700k? Sorry dude, wont happen. Rubber domes? There's no way that's a good idea.
I will say that the issues people are bringing up, however, like certain keys being harder to reach, I would argue that the goal is gaming. You could type with those, but that's not the intent. And if you need to jump, or use space for another reason with regularity, it would be simple to map to a key within reach.
I can really see myself hanging out in my recliner with a set of these, and that's simply a draw. A big draw. Personally, I'm more likely to use an Orbweaver/Mouse combo, but I'd be interested to try these out. Too bad they'll never be realized through this avenue.