it alld epends on the market. these high res screens are only on the absolute most high end phones.
peoplestill buy 720p 50" plasmas if they are cheap. the majority of phones still have 480x320 or elss resolution. hell At&t even said that the 3gs was their 2nd highest selling cellphone. and from stats i've read online 2/3 of android phones sold worldwide cost $150 or less (not sure if that includes carrier subsidies, but i'm assumign that still produces a pretty decent phone given an optimus V costs less than $150 and its a 480x320 phone).
most people do not want high end. that is why high end stuff costs os much, its a niche market relatively. i'd love to have more high res laptops etc, but they will cost more and we live in an age where $100 more for a laptop that produces what most people would consider negligible benefit, is baby food or something to your average broke ass american (or heaven forbid the rest of the world which is even poorer).
in south american countires people still buy refurbished 15" and 17" lcds because they are cheaper. they know a 27" 2560x1440 display is nicer, but it costs 9 times as much.
you guys might as well whine that not ever car ni america is RWD , with a DSG gearbox, and like heated seats, and a nav system with google maps and turbocharged direct injection start stop and a lithium ion hybrid system.
since well if EVERYONE had to buy a car like that the economies of scale would force prices down say 15%. of course 15% less than a lot woudl still be liek 100% more than an econobox.