The big problem is Windows. If you look at the driving force behind all PC/Laptop sales for the last decade or more, it has been the Windows OS, and since it can't handle high-res screens well (with regards to scaling what is displayed), there have not been any high-res screens that do not natively display something that is readable to the average person. Look at the surface with Windows 8 and what resolution they chose. When Windows catches up, so will laptop resolutions.
I was kind of hoping Windows 8 was going to address the issue, but looks like yet another F$%^# up by redmond. They also need to compete on screen resolution if they want to beat Apple. Apple has highlighted that people want something that looks nice, provides a great user experience, and feels solid (ie not cheap). Build quality sounds like it is a pass and arguably Windows have worked on the user experience (epic fail from what I have tried of the pre releases of Win8), it also looks ok but they failed to provide the finishing touches of a nice high-res screen to make everything look like you can reach out and grab it.
I have wanted to have a 2560x1600 laptop display on my 15inch for a long time, since before the "Retina Display", but everyone I work with think I am crazy for wanting it. The screen real estate is precious to a developer. Yes the text is small, but I have the screen reasonable close to my face and could easily work on a smaller font if it was crisp enough for reading. I also want a 16 core processor and 64GB RAM in my laptop, at least until the broadband speeds allow me to run a private cloud at home that I can access from anywhere. I use virtual machines a lot and regularly exhaust my 16GB RAM and 8 cores on my laptop anytime I want to run end-to-end testing.
I hope Linus can push for something to happen before Windows catches up, but I have my doubts.