Now that windows 8 and mountain lion both for the first time credibly handle HiDpi I agree, it's about time we switched. But laptop makers are hardly to be roundly chastised for not going super density until now (though higher than 1386x was always workable) since the windows experience of hidpi was pretty broken. Fonts would get clipped inside too small bounding boxes, things wouldn't line up, chroming would be too small and so on.

Now all we need is linux to credibly support it as well, or at least a linux built for mouse use. There are still many, many usability issues in gnome with a high ppi screen.

Also, lets not forget how far mobile gpus have come in the last few years, it would have been impossible to push that many pixels with anything but the most minimal of 3d use cases.

It's a much more complex problem than linus would suggest by simply having oems switch panels. Witness how relatively complicated apple's solution is, which came after years of supposedly "somewhat" supporting hidpi. Use the hidpi macbook pro at 1920x on the ivy bridge gpu and it's still noticeably laggy at some 3d operations.