Well, I can´t say no to that reasoning but I wouldn´t underestimate Retro, I´m sure they work as hard as they can and they believe in what they´re doing. I know they are capable to do great things, DKTF is such an amazing game! It truly is, but people didn´t think the same, or there wasn´t too "new" to buy it.
I think Splatoon has sold that great because it is new in almost every aspect of the game, fresh gameplay, nice visuals, adorable characters, nice difficulty for everyone (while DK is always hard, at least for me, I still can´t believe the freaking giant octopus killed me like 40 times in a row xD) and so on.
Splatoon is a beast, and I really hope it keeps selling even better once Splatoon 2 is released, as it deserves it, but I still think there is enough place for a new DK in the future (though obviously, there should be a new Metroid first :P).
