Since the new LCDs are very expensive, putting them on a laptop with 14-16" screen might make the laptop price go above a certain threshold for buyers. Tablets and smartphones with smaller screen might give the buyers a sense of "not too expensive".
Samsung will soon have a 3200x1800 display in their ATIV Book 9 Plus.
Yes, you're right. There's also Google's Pixel Chromebook thing.
But it just boggles my mind that that's about it in terms of laptops with decent screens.
I use Linux, and don't want to pay the extra cash for the Apple logo, so that's not really a good option. The Google thing looks interesting, but the local disk is really limited.