About those so-called "Retina+" displays...

Are these even necessary? They'd just drain battery more effectively than running Infinity Blade II and N.O.V.A 3 running at the same time (if that was possible) and people aren't really going to notice, or bother noticing. So is the practical threshold of display sharpness going to keep Apple where it is, or defying tradition, will Apple go the "specs first" way with the screen (and the screen alone)?