I might be mistaken, but I bet a console could be designed so that it could be hooked up to a PC via USB (or something similar) so that the console could augment the PC's processor and RAM.
My computer is over six years old. At this point, it cannot play many games at decent graphic levels and performance. But if it could offload some of its needs to my Xbox 360, then I could probably play almost any game.
I hope something like this is included in the design of next generation consoles.