When it comes to ports, anything multiple years old is pretty much ancient. And I dunno about that, even if we disregard the tsunami of ancient indies, there's MK8D, Pokken, Tropical Freeze, Skyrim, Bayo 1 + 2, Diablo 3, Dark Souls, Hyrule Warriors, Captain Toad, NSMBUD, LA Noire, LEGO City, Monster Hunter Generations, Rayman Legends, Street Fighter II, RE Revelations 1 + 2...
Imagine if all the resources and manpower spent on that multitude of games had instead been invested in creating fresh new content.
I suppose in that regard I cant disagree with you, but considering Nintendo operates multiple teams, and several of those are multiplatform releases, I doubt too much time or resources were used up. Their lineup for next year is already pretty impressive