This is a good example of why I consider statements of the form "I never print larger than X x Y, so I don't need more than Z megapixels" to be short-sighted. Good modern displays already exceed the resolution of early DLSRs like the Canon D30. In 10 or 20 years we'll probably have 2 metre displays with resolutions measured in 10's of megapixels.
The _size_ of this display is not larger than previous laptops. I dont think that laptops will have much larger displays in the future, either.
If you fix the display size at 15", and the viewing distance at some distance, then there is a finite limit to how much resolution you can benefit from. Apple claims that their "retina" displays are at that limit (i.e. that further increasing the resolution will have no perceptual benefit).
Tv/home-cinema display size have increased tremendously in later years, and I can easily see 2 meter displays with 10s of megapixels at some time in the future. If they use transmissive light, they will generate quite some heat/draw quite some power for a high-brightness image, not matter how efficient the light source. Perhaps reflective light (like printed images) is more suited for wall-size applications.