Nintendo twin-screen 2DS isn't quite what it appears.
USGamer reports that the new hardware actually houses a single, large touchscreen which is separated into two and, in the case of the lower portion, reduced in size by nothing other than the handheld's plastic casing.
This means that it is only Nintendo's firmware that prevents the top screen being touch enabled and stops the hidden portions of the panel being utilised.
Could modders reverse this, effectively creating a large-screen touch-enabled Nintendo tablet. We'll see.
The site also notes that 2DS isn't currently scheduled for a Japanese release, quite possibly due to the machine's ongoing dominance in the region. Perhaps once those numbers begin to wane Nintendo will look for a release to reinvigorate it.