Intelligent Systems seems to be able to make like a half-dozen games at a time, so I wouldn't be concerned about that part. For instance Fire Emblem most likely has its own team (Awakening released in 2012, If in 2015, most likely 3 years in development), Pushmo most likely has its own team (releases in 2011, 2012, 2014, 2015). Sticker Star released in 2012, Game & Wario in 2013, Codename STEAM in 2015, I doubt the same team worked on those three.
Basically I give up trying to predict when these guys can be ready to release a game, it's like they just spawn a new game from nothing whenever they feel like it. They aren't even that big, only 130 people, pretty average size for a game studio. Their efficiency and versatility is mind boggling.
