Don't competitive players refuse to use wireless controllers? At least, in tournaments and such? I thought that was the reason Nintendo released the adaptor, so that people could use their old controllers without connectivity being an issue.

You are the first person to point out the real reason.  The competitive scene needs wired controllers. Hosting a tournament with hundreds of people will cause tons of wireless interference. And with this release Nintendo is trying hard to appeal to this market, which is why we have For Glory modes and Nintendo hosting and sponsoring tournaments for the first time in history.

Heck wireless interference might even be a thing with 8 player modes. Considering there's also cell phones and other wireless devices nearby.

Yeah, I thought that was the case. Nintendo really tried to appeal to the competitive scene with Smash Wii U, and for that I give them props. This is also probably why the adaptor is seeing such a limited release, because Nintendo really only anticipated the hardcore market being interested. Little did they know that more casual players want to invest in it as well.

They have to have engineering designs to run the patents through.  They also need the plans for FCC approval.  You just can't make any wireless device.  It has to be in compliance regulations.  And yes, this does concern you as a consumer.  They can make an improper wireless device sending signals that are harmful to humans.  It's why these regulations exist in the first place.  also the OP is asking why a gamecube adapter.  I gave my response, a little bit of column A (Laziness on Nintendo's part) and a little bit of column B (Too much of a headache vs using what they have already).

Still, we should get the controller as an option.

Dude it's just a question. I'd really like to see a wireless gamecube controller and it makes much more sense than the solution they came up with. Again, wireless controllers do not add a significant amount of input lag at all, I've linked multiple times to tests showing that. In fact, they don't have anymore input lag than an arcade stick.

Read the thread, I've posted multiple times why that is not an issue. First off, most players are not competitive players, at all. Secondly, wireless controllers do not, in reality, add any noticeable amount of input lag.

I don't think making a new wireless controller would be an issue at all in any of those regards.

Dolphin already just added suport to the adapter. But intill someone like motionjoy does it. It still don't work as a 360 replacement.

If you got spare Nunchucks. You can replace both joysticks on the GC. And they'll be brand new. Nintendo recycles tech all the time.

Please read my response once more. I am simply saying that the competitive scene prefers the Gamecube controller method, not only because they find it to be more comfortable, but also because they can plug it in and not have to worry about their wireless controllers connecting to other consoles instead of the one they are competing on. They can also just unplug the adaptor and move it to another console instead of unsyncing their controller to one console and syncing it to another.

While competitive players do not account for a majority of Smash fans, it is undeniable that Nintendo has been catering to them with the new iteration, as evidenced by the creation of the For Glory mode, the creation of the limited released GameCube adaptor + new controller and the alteration of the physics to resemble those of Melee, the most competitive entry in the series.

Finally, the fact that third party wireless Gamecube controllers for the Wii U that are supported by Nintendo and are able to be purchased at this very moment exist, makes this entire conversation irrelevant.