Catering to these users now will preserve the design for the next round of display technology. We all know the future belongs to these types of displays.

Sure, in a perfect world when you have no other pressing issues to attend to. If you do, making @2x versions of every image on your site is going to slide down the scale of necessity.

Have you looked at the Windows 8 tablet resolutions yet? > 1080 will be the new defacto standard.