Please understand. Oh wait, that's Iwata.
Still, here it goes.
"While online play is certainly technically possible for us, it simply wasn’t the focus for us this time around," Miyamoto said. "What we really wanted to do was to create something that people could experience fully while playing comfortably with others who were nearby them, and this is something we decided would be best for Pikmin and the best case for Mario here as well"
It's 2013, Monsieur Miyamoto!!!
BUT DO NOT DESPAIR!!
"Now that is to say the answer to this question might change in ten years time, if there’s a future game where for example we don’t think it’s important to be able to see the face of the person you’re playing with, then we might be able to focus more on some online function there. But for right now our focus is really on a comfortable play experience with people in the same room."
Prepare to play some Mario online 10 years for now
I would've liked to have some online multiplayer in this game.