Probably because Nintendo doesn't want to invest their resources into one of the most over-crowded genres, especially when this genre requires a fairly massive investment and dozens of games that made that investment fail to (come close to) breaking even every year ...

Nintendo's biggest budget games tend to be the best games in a genre where there are only a couple of games (worth playing) released every year which means that the risk is low ... The FPS genre has (at least) a couple of decent games released every month and only a few ever obtain the return on investment that Nintendo desires from their projects.

OK. Let me make this simple, for everyone wondering "Why does Nintendo not do this?" or "Why doesn't Nintendo do that?".

Let me ask you another question, is your question based on something everyone else is doing? If so then you may have just answered your own question. So let me ask you another question.

Why would Nintendo do what everyone else is doing? I'm not saying they wouldn't pursue that sometimes, but is it fair to expect that constantly? The answer to that is maybe, for a while.

Realistically though, it's not Nintendo's way of doing things. Why? Because almost every time they approach business this way, they end up losing something. Be that market share, customers or profit. On the other side of the coin almost every time they try to differentiate, they gain something. So which one do you think works best?

I'd say differentiation. And guess what? They have figured that out as well, so why not you?

Rather than asking them to emulate something that already exists every damn turn, and every damn second, why not wonder what they could do that nobody else is doing? If you're eager to speculate, that approach may leave you with not only more food for thought, but less disappointment over what Nintendo does announce. Odds are you'll probably begin to appreciate the little differences they put so much attention on, but that as of now get very overlooked by the enthusiasts that like to run their mouths so damn much.

Realistically though, it's not Nintendo's way of doing things. Why? Because almost every time they approach business this way, they end up losing something. Be that market share, customers or profit. On the other side of the coin almost every time they try to differentiate, they gain something. So which one do you think works best?

 The first time I saw your avatar, I laughed and I thought to myself, "How silly a dog can't teach! Dogs are dumb." Then I read this post and I must say I now see how prejudice I have been. Dogs are just as smart as humans.

Brain (Fam Guy) & Brain (Insptr Ggt) have made many advances for your species.

You were kind of harsh though but that's a Bull Dog for you.

Azeover hit it on the head. However Nintendo could do a FPS in their own unique way. They have of course with MP 1-3 but also a Mario Paintball game would rock and sell millions as well while catering to both casual and core.

So I wouldn't discount the possibility but I certainly wouldn't expect a Wii version of Halo/Killzone aside from The Conduit.

Whether or not Nintendo is trying to shield little kids from violence, broadening the appeal of your gaming console is something that Nintendo, Microsoft and Sony all aim to do for the most part.  To me it is surprising that Nintendo hasn't at least published a few good FPS games.  007 Golden Eye and Perfect Dark were massive in their day, Nintendo should really look back at that.

Third parties are throwing junk FPS games on the Wii (except the Conduit), if Nintendo gets the chance to publish an excellent FPS game they should take it.

 How about a Mario vs. Sonic (Nintendo vs. Sega) paintball?

You should ask yourself one question first:

What would Nintendo gain by producing FPS games?

Cheaper to make party games, which also sell more.

 Well, Miyamoto once said he "could make Halo" if he wanted to. so...

http://www.joystiq.com/2007/05/07/miyamoto-interview-i-could-make-halo/

It'd really be interesting to see some kind of multiplayer third-person or first-person shooter based on the Nintendo franchises, or maybe something completely new, you know like the "Mario Kart for shooters" or something like that. I think there's an idea.

I just wish Nintendo would blatantly rip off Team Fortress 2 using Mario, Luigi, Toad etc with the Nintendo touch.

Same character/weapon choice FPSs like Goldeneye and PD are stale and boring, class based shooters are so much more fun and deep.