Honestly, the worst case for the Wii is:

1. It passes the Gamecube's lifetime sales (21 Million) by March 31st 2008
2. By September 31st 2008 it passes the N64's sales ( 30.75 Million)
3. By September 31st 2009  it passes the SNES (49.08 Million).
4. By March 31st 2009  it passes the NES (61.79 Million).
5. Between March 31st 2009 and September 31st 2011 (the last 18 months before Nintendo releases the follow up system) the Wii sells 21 Million systems (Roughly 80 Million)
6. Over the next 24 months the Wii sales drops off and it falls (just) short of 100 Million consoles sold

As I said before, if the Wii turns into "dead fad", it will end up slowly dying down to NO FEWER than Gamecube sales rates. It will be able to keep up with the GCN rates.

But as it already has millions and millions of consoles ahead of the Gamecube (by this point in its lifetime), it's basically guaranteed to top the Gamecube at least by that much.

Additionally, there are ~105 games (excluding announced VC titles) announced to release between now and the end of 2007. That will result in phenomenal sales growth, as the Gamecube didn't get this expansive a library until easily a year later.

Thus said, it will at least be able to stay well ahead of the Gamecube's sales rates. I give the Wii, at the absolute very worst sales, 45 million consoles in its lifetime. And this is seeing it in disaster's eyes.

On the good side, if it DOESN'T slow down and only continues to get better (which 105 games in the holiday season definitely makes it look like it's getting better), I predict it will sell approximately 100-120 million in its lifetime. And I predict that will be considered bigger than PS2, since Wii has had better success with consoles so far than the PS2 had (which means that a large number of PS2 console sales were rebuys due to hardware failure).

Besides, you have to know with all the cash they are making from this, if it fails they will make something like a PS3 but cheaper. But I can't see this thing failing. Not with Mario coming out.

 Well, I think you've got your bases covered.  It'll either a)be extremely successful or b)it won't.  I bet with one of those two predictions, you got it...

This site is starting to lose its quality. Too many pointless forum topics.

 The more people in the forum, the more topics you're going to get. All we can do is try to sort out the good from the bad, and remind people that there's a search function in the forums (there is, isn't there?)

Anyways, There's no way the Wii won't continue to be huge. Especially in Japan. If you haven't noticed, Japan is where the Wii is seeing it's best climb in dev support for both "casual" and "hardcore" (damn I hate that dichotomy) games.

Neither. Wii will top out around 50 million, 08 will be the big slow down but it will surely hit 50 million in the reminder of its life. Alot depends on how long a life nintendo plans for the wii.

It's only slightly better than "hardcore" and "softcore."

good point--i only see the wii being a big p;ayer for about another 3-4 years before it gets an over haul like the DS did

There will be no slowdown in 2008. Even if one region slows down for a few weeks, wordwide for the year as a whole Nintendo will sell everything they can produce in 2008 and that will mean more Wiis sold than in 2007.