There is a simple reason why Nintendo won't ditch region locking. Xbox One and PS4 aren't released yet, Wii U and 3DS are. Removing the region lock would make all region lock references in the manuals and packaging invalid and misleading.
Apparently there are some reasons behind the region-lock.
http://www.nintendolife.com/news/2013/07/satoru_iwata_there_are_some_reasons_behind_region_locking