I can explain that very easily.

Handheld games are cheaper to produce, and the handhelds themselves sell as much, or sometimes even more, than the big consoles. This is why a lot of JRPGs are on DS, PSP, 3DS, and Vita now, because they can have the same amount of content as the ones on console, but can also be developed for a fraction of the cost that it takes to make a console game. It makes sense when you think of it that way. Sometimes making games for consoles is too expensive and risky, especially for a new IP.