I've used a Dell laptop with a high res screen, and it sucked. I went into an aPple store and looked at the retina mAcbook, cracked open Excel (And left it open to scare hipsters) and the interpolation sucked worse than the Dell's tiny cells. Some people will like these screens (GIS, CAD, photographers), but for most people a normal screen in the 120ppi range without interpolation is best (or a small screen at WXGA if it's not your primary machine).
Problem is, the media uses mAcs, so the ****storm of articles unthinkingly praising these displays is going to cause normal computer makers to inflict them on normal users, who don't need/want them.