There's no reason at all why they couldn't water cool everything. There's small and thin designs out there that are both cheap and very robust. For example.. Just look how thin that cooler is! And it HALF'S load temps on that GTX 580 while running much much quiter then the stock cooler. You can get very thin and small radiators that would fit into a console sized box with no problems at all. Imagine the benefits, Cool running and quiet which could also result in higher clocked parts.