The current 17" is 1920 by 1200. They're moving everything to Retina, right? How much would a pixel-doubled 17" portable display cost? Prohibitive, I'd guess. It's almost the same resolution as a 4K TV! Plus, as other people pointed out, the sales numbers of 17-inchers are just low, low, low.
4/23/12 at 1:26pm