They wouldn't do that, this is there cash cow right now and every store I go to has 10-30 gamecube controllers. I do hear highly rumored that they new there would be shortages and some stores may get a hand full before Christmas but don't expect a ton more till after Xmas.

good thing i have them all :D

http://www.gonintendo.com/s/243315-wii-u-gamecube-controller-adapter-not-discontinued

Now I'm glad I bought two of them at Best Buy on the day of. I didn't even have to preorder.

More stock in the UK before Christmas would be great, I'd like to play Smash with GC pads with my brothers over Christmas.

I don't believe it.

No, I mean I literally don't believe it.

"We would like to reassure you that GameCube Controller Adapter for Wii U has not been discontinued by Nintendo of Europe and we are doing everything we possibly can to meet the demand which is currently outstripping supply.

We are unable to comment specifically on individual retailer stock levels and as such we ask customers to contact their local retailers directly regarding their availability of this product. We would however like to reassure you that we are working hard to ensure that additional stock can be made available and delivered to retailers."

http://www.nintendolife.com/news/2014/12/nintendo_dismisses_rumours_that_the_gamecube_controller_adapter_has_been_discontinued

GameCube adapters will be sold as long as there is demand for them... probably throughout most of Wii U's life and maybe beyond that.

I wonder how much of these "discontinuing products" reports we´ve seen lately all around the internet are really true..

It makes no sense to discontinue a product, let´s say, the WiiU GC adapter/controller or Amiibos os any kind, when they´ve just lauched and it´s clear that there´s a high demand for those items.

Of course many of them went out of stock due to the incredible demand and Nintendo will need some time to re-stock them.
To me, it seems that a few retailers/websites are spreding this kind of report to justify their criminal prices for the remaining pieces available. So far, we´ve not seen anything official from Nintendo, with the exception of that small note from David Young, one that I look with a certain degree of uncertainty

Official word from @NintendoAmerica: no #amiibos are being discontinued. pic.twitter.com/7cbdqcsp2e

— #MKGL (@MKGLofficial) December 8, 2014

Nope. 

Is that just your target specifically or all of them?

All he said was that the reason that we didn't see them initially was because Target didn't want them (adaptor and GC controllers), but now they do and will start carrying them in the future.