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with the 3ds sales flop and the current marketing issues, it wouldn't be wise to make another pikmin re-release when the next game has already been announced unofficially.

Well, there's this new Wii console coming out, not now, though..maybe it might be released then..? It's called the Wii U.

They said it would be realesed when the Wii U launches

I sort of agree with you some portable games are bad (warioland 4)

XD same here

It'll have intense graphics if the Wii can't hold it. I mean, look at some of the recent games made for Wii.
My guess is that they got held up with other games that they already had set-n-stone for the Wii, whereas Pikmin 3 for Wii was just a subject brought up a lot in interviews (mostly by the interviewer). Nintendo also had a very unproductive year because of the Earthquake that backed up so much (like the release date of Skyward Sword).
Since they were falling behind in consoles (with the semi-recent releases of PS3 and Xbox stuff), they had to catch up with a new console, so they must not have had enough time to fit Pikmin 3 for the Wii. I don't know the answers, and probably never will. That's Nintendo for ya. But I heard that Pikmin 3 will either be released for the Wii U debut or close to it.