If you take a huge for it's day game like mario64, banjo kazooi, Zelda OoT or mask, or a bunch of others for N64 and change the combat to leveling up turn based fighting and toss in a money system that Zelda already had (it also had cutscenes) boom ya got a RPG. And on a system devoid of traditional RPG's almost entirely why wouldn't a 3rd (or 1st or 2d) party want to as it would sell just from huge demand and no supply?