I am fully on board on that Nintendo is maximizing profit like your average capitalist mega corp. I wouldnt really bother if they decided to actually release new content in between...
It'll just make Nintendo feel they made the right business decision to price at $60 without any real effort.
Lastly, maybe Nintendo will prove me wrong and announce extra content for the game before release.
This I cant get behind though, There's probably more effort in this port than the other Wii U ports you mentioned outside of the Bowsers Fury addition.
It seems to not only be a transition to full hd from sd but also making it run in higher framerate, new control schemes as well.
But we'll probably get the full picture in the coming months before I fully judge here.