If it's true that Nintendo gamers, and particularly portable console ones, are great 2D fans, while MS and Sony gamers are more for 3D, won't 3D boost more the sales of PSP2, if it will offer it, than those of 3DS?

I think you are working from a wrong assumption. I don't think it is as simple to say Nintendo = 2D fanatics; MS and Sony = 3D devotees. Also, you are putting the start date of the console war with the PS2/N64/Gamecube era, which is a common mistake for anyone to make regarding their relative age as the majority. I make it all the time assuming most here grew up playing Duckhunt and Super Mario Bros. after our big brother put down the controller.

Many of us, including myself, who were aged 12-16 in 1996 grew up from the NES to the SNES to the PS1 to the N64 to the PS2 and on. There are many of us who transitioned from 2D to 3D, look back once in a while to play an old school game like Mario Galaxy or New Super Mario Bros. We could care less either way so long as the focus is on the gameplay; not on the graphics at the expense of the gameplay.

Basically, once the 3DS hits the shelves in Spring 2011 it will garner a media fervor mainly concerning how a small Japanese video game corporation can create a glassless 3D experience without creating a 3D television. There will be comparisons to Sony, Toshiba, Panasonic and the like highlighting how if a video game company can do it, then why are you guys charging $3000 for a 3D television?

I don't think there will be much thunder left to steal once the 3DS hits. The PSP2 will further confirm the theory that a late entry into a video game console generation correlates with lower lifetime sales.

I say correlate and not cause for the good reason to not sound like a conspiracy theorist where correlation = causation. Entry price, initial software library, and exclusives defining the experience have just as much an effect on the outcome for any console in any generation as does the gimmick power of 3D or graphics processing capability.

3DS will offer 3D without glasses, something never seen on the gaming market before. (Virtual Boy technically belongs to the glasses side)

People will be amazed no matter what. No more hassle with expensive ass glasses.

Also, if PSP2 offers 3D without glasses, the comments from Sony about 3D tech being "imprecise on portables" will be used as lulz provider, just like wiimote trash talk back in the time.

Unless PSP2 is a tablet with a big ass screen. That wouldn't be considered a "portable" I guess.

how about 2D games with 3D backgrounds and effects.... would that apease your doubts?

So... 3DS iz teh d0med?

A thing like that makes spring to my mind a puppet theatre or an optoelectromechanical lion hunt game I had when I was a kid...

Of course! By now you should know that Nintendo exerts irresistible attraction force on d0m...   

yeah, im just gonna post a reaction image......

PSP2? I'm not sure that it will ever exist...