A lot of people implied it.

They cost money if changes need to be made like if they need to tone down a game then they need to decide which physics/objects/textures to remove, change animations/graphical effects accordingly and so on. but if you have a game already running on a system and you want to port to a more powerful system then theres no design choices that need to be made. They only need to make sure theres no bugs so yes it costs money but for the largest publishers in the world, its an insignificant amount and the retuns easily make up for it.

I wouldn't say so, really.  I would say maximizing potential profits a Vita version maybe could have... just as it would to port it to every device you can.  However, they were looking at if the game would sell modestly.  To get in as much guaranteed money as they can would mean to stick to one platform.  If we say bringing it to the vita would result in a slight boost in sales (the 3DS version selling less than it would have if it became multiplat), that doesn't exactly translate to those extra sales making it more profitable.  The port itself also may not cost very much, but there are a bunch of other costs besides making the port itself.  Costs that you don't see.

It's fun picking on the Vita

Prob both, but more so the vita. That system prob won't do much overall. The wii u will prob end up as a disappointment in sales.

No, no, no the entire console industry is doomed because so-called experts have been saying this for years ;)

But seriously I worry more about the Vita since most of its games are stuck in Japan and I always have faith in Ninty to turn a dire situation into profits.

Yes.

That's not what you said, however. You said "the wiiU is already as good as it gets." That has nothing to do with multiplats, but with graphical output. Do you honestly feel that the Wii U's potential has been tapped?