Goodness, could you be more concise with your thoughts please? I didn't read your entire book, but I did read the first 3 or 4 paragraphs.
"Gamers" aren't being renewed like they used to be. In the old days of Nintendo, you could pretty much gauruntee that every kid at least wanted to play the (S)NES. Nowadays, kids have so much being thrown at them, Nintendo is glad to have them know the name of their company. A lot of adults feel like gaming is for kids, and those who don't think Nintendo is for kids. Every faithful Nintendo gamer bought the GC and it was listed as a failure, how stupid would Nintendo be to only cater to those people with the 2nd gen DS?
I'm thinking that something like 33% of the people who buy a 3DS are going to do so solely based upon the fact that they can watch/game in 3D without glasses. Nintendo seems to realize this, and will be going hard on delivering TV shows and movies in 3D. Nintendo tried the "stay true to gamers" route, and gamers turned on them for the PS because it could play CDs, and then the PS2 for DVDs.
Then there is the fact that 3rd parties made exclusive games for a system they thoroughly trounced in sales.
Maybe it can be seen as arrogance, but Nintendo knows that their core gamers are satisfied with their software, almost regardless of hardware. The powerful graphics (drain number one on the battery) are mostly for developers, and the 3D (drain number two) is mostly for the non-gamers who bought a DS and let it collect dust in favors of iPhone games and apps for cooking and such.
If battery life is that important to you, turn off the 3D, turn off the sound, put it on lowest brightness, and never do anything on it but game.