As much as it pains me to say it, there's some truth that they probably wouldn't sell well. The RPG base for Nintendo systems left a long, long time ago. Think it might have something to do with SquareSoft jumping ship? Nah.
In all seriousness, I think it's a silly decision. But life will go on, as it always does. Looks like I'll be importing these buggers, if Nintendo doesn't see the light and at least allow someone like Atlus or XSEED to publish the games stateside. I had honestly given up on these until the European localizations were announced, anyway.