Honestly, Nintendo should've done the following:
Holiday 2013 - Mario Kart 8, Wii Fit U & 3rd party games like Sonic
January 2014 - Wii Party U
February 2014 - Donkey Kong Country Tropical Freeze
March 2014 - Zelda TWWHD
May 2014 - Super Mario 3D World
July 2014 - Wii Sports Club (Should've never been digital first)
Then the rest of 2014 continues as is.
Mario Kart would've been big enough to have a big Holiday & the gap would be much more tolerable. In the end, it wouldn't change the actual games but would create the illusion of consistency.