It's also worth noting that Mario Maker and Splatoon are Nintendo's top products at the moment, so they're committed to maintaining both as a platform for future sales. Thus, the more hype we the fans generate about Octolings, the more likely they are to hear and provide. ;)
As it hasn't been mentioned here yet,
Super Mario Maker is getting an update on November 4th, which adds in mid-stage checkpoints, Mushrooms that manifest as Fire Flowers if Mario's already big when he hits it, Nintendo-made courses, event courses, and a harder version of Gnat Attack.
what was it that release stated, "to keep continued interest in our three strongest properties, Mario Maker, Splatoon, and Smash"? i think that's how it went. Noire'll know better.
Mario Kart 8 has been consistently outselling both versions of
Super Smash Bros. 4 in this generation so far, at least in Japan. I'm not sure how worldwide sales go, but
Super Smash Bros. for 3DS likely gives it an edge.