Stupid stupid apple, there was no need for this dense a screen on the already dense screen iPad mini other than to appease the people who think they can see a difference (or are holding the iPad mini to close to their faces).
Or possibly Apple just wanted to be able to get rid of the non-retina iPad configurations at some point to simplify what they and developers are having to build for. Sure the iPad 2 and non-retina iPad mini still exist, but I would be willing to bet money that the new retina mini will get at least one more major iOS revision than either of those two older devices. If they would've kept the mini on a non-retina display for another generation, they would've had to keep non-retina support in the OS and apps for another generation as well.
As a developer, I'm looking forward to eventually dropping non-retina support as well. Of course by then, Apple may have thrown another curveball with yet another display size to support. But at least, in theory, I won't have to include 1x and 2x versions of every image.