The limiting factor hasn't been the size of transistors for a long time now, it's been heat. Doesn't matter how powerful your computer is if it's running hotter than a rocket nozzle.
Besides, memristance is coming along well enough that in many applications it'll be more useful than traditional chip architecture anyway. Being able to savestate/resume your entire system in a handful of clock cycles and work the hard drive directly into your computing circuitry is a pretty damn powerful notion.
edited 10th Jan '12 5:20:09 PM by Pykrete