[citation][nom]jupiter optimus maximus[/nom]1600 x 900 resolution is not good enough.[/citation]
Not only is this meant for business, as deftonian mentioned, but you have to realize that most programs, and web pages are designed with particular icon and text sizes that don't work so well when you go too high in resolution for the size of the monitor. Tablets and phones have been able to increase their PPI because their programs are designed around those particular devices, and basically started over. This is going to be a much bigger challenge for desktops as there is a wealth of software designed around a much lower PPI.