They'd remake the entire game from scratch with 3D for the 3DS, it'd be just like the original only with graphical enhancements, some sound enhancements, and a few extras. However, in order to recoup production costs, since they're anticipating low sales, the game would be $60. Imagine it got REALLY rare like Radiant Historia, no reprints, $60 is the lowest you could EVER get it (maybe $50 on a one-hour Black Friday lightning deal, but you'd have to be VERY quick).
Would you shell out the $60?
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Kid: She wrote a bad word!
Jade: I write what I feel.