It would absolutely
have to be for the New models. Second stick, ZL/ZR, 3D tracking and speed are all necessary.
I have noticed not too infrequently that I'm liable misjudge distance in Splatoon when there aren't enough reference points near the enemy at whom I'm aiming; on these occasions, I've joked that Splatoon needs 3D capabilities. I think that there are too many reasons why Splatoon 3DS is a bad idea, but as someone who insists on playing every 3DS game with the 3D slider set to max, I'd really appreciate that view.
+No Gyro That would be super strange
... but the 3DS
does have gyro! It's just that, along with AR cards, everyone, Nintendo included, completely forgot that it existed within months of the handheld's release. It's not nearly as capable as that of the GamePad, but nonetheless theoretically sufficient for aiming adjustments.