I already had a Wii U. Splatoon is fun, but I haven't really got into it. The kids have played it a lot, although currently, one of them is playing Mario 64 to death on the Wii U virtual console and the other is playing FIFA to death on the PS4. Happily, the Gamepad means they can do this simultaneously.
I have no idea what will tempt me into getting an NX, because I still don't know what form it will take. If it were a home console, then probably the next Mario Kart would tempt me, but the NX had better still have the off-screen play feature like the Wii U, or there won't be happy pandas in our house.