You know that I can't answer the first two of those due to lack of info, and I won't answer the last two because I'm not trying to claim that Nintendo keeps a console going when the public don't want it.

However, I suspect that consumer interest for the Wii will remain high for a long time.

I'm sure interest will remain for a while I'm just thinking if the next console can do all the wii can do plus more at a still afordable price.  The consumer might very well move on to the next console

Sure, but Wii's also far, far more successful than GBA ever was, with far more room to lower it's pricepoint.  It's likely going to do more than 22m after Wii 2 launches.

I don't think it'll be as much as PS2 after PS3 (~44m and still going), but I do think it could be around PS1 after PS2 (~31m).  And by the time Wii 2 launches (end of 2011 to end of 2012), Wii could already be 110-125m.

no if nintendo releases a new console, and it's likely they are going to be one of the first.

I wouldn't be surprised if it never does. Sony and Microsoft are adopting their own motion-sensing mechanisms for game-play, and Wii is losing popularity due to so many low rated games. I own all three consoles: 24 games for PS3, 20 games for 360, 0 games for Wii. I simply use it to play my old Resident Evil games and LoZ: Ocarina of Time. My wife owns 3 games for the Wii that she occasionally plays, but most of her games are Game Cube. We were VERY excited to purchase the Wii, but just haven't had much pleasure with it. From what I've seen, most people are experiencing the same thing. My niece was having more fun with my PSP than she was with the Wii.
Lastly, I predict that a very large portion of the Wii owners are not even avid gamers. For example, my wife's parents enjoy playing the Wii, as does my mother, my uncle, my older sister, etc. My best friends, however, who are hard-corp. gamers, play the PS3 and Xbox 360. Families are beginning to purchase PS3 for the Blu-ray, and with the Motion Controller they can get the same abilities as the Wii. Many will also go to Xbox 360 because of project Natal. Eventually Wii sales will slow down greatly and just consist of the TRUE Nintendo fans, which based on Game Cube and Nintendo 64 sales, is a much smaller number.

Ugh. I'm getting tired of posting these figures, but well...

72% of Wii owners own or owned a PS2
42% of 360 owners also own a Wii
42% of PS3 owners also own a Wii
Wii was the 2nd most played console per hour in Feb 2010. In Jan 2010 it was 1st.

... eventually, PS3 sales will accelerate greatly and just consist of TRUE Sony fans, which based on PS and PS2 sales, is a much bigger number.

We are doing wishful thinking, do we ?

Huh? I can't tell if you're agreeing or disagreeing.

This is one of the few cases where the majority will be right.

I don't think it will, never have and still don't. To assume blindly that it'll have three or more 20 million + selling years is very naive and all I see in this thread is assumptions that need several years to proven wrong or correct.
No consoles are immune to declining sales and selling at a a fast pace does not automatically equal selling for a long time, anyone with a tad of insight into markets of any kind could tell you as much.

So, let me get this straight; anyone who votes "never" are delusional fanboys who are only acting upon silly wishful thinking? What a mature standpoint from some of you. Even the mighty DS is taking a plunge (yes, a plunge, 20% + down yoy this years so far). There is, at this point, nothing delusional, or even unrealistic, about claiming that the Wii probably won't outsell the PS2, it appears more and more likely as it fails to attain the somewhat lofty hardware sales predictions in here time and time again, I missed my own 2009 prediction by around 6-7 million units (overshot it, that is) and I was being on the moderate side of things.