Uh the Nes sold more than the Snes. The Gameboy and the Gameboy colour are the same thing buuuut the Game Boy advance the new handheld that sounds similar to the old one sold massively less. Nintendo have been repeatedly making the same stupid and obvious mistake but refuse to learn from it.
Nintendo tries something new, and yeah, they do always upgrade their consoles, but you should remember Sony has also been making the same mistake. Sony is doing extremely poorly with it's PS Vita, while the Nintendo 3DS and the upgraded version, the New 3DS, are still selling like hotcakes. Everything has their ups and downs.
Also, I can't really be sure if the NES sold more than the SNES, even if it did, just how many people had a SNES though? Also, are you living in the past, or what? Nintendo's confirmed it has a new StarFox, two new Metroids, two new Zeldas, and one little Mario. That's right, you heard it; Mario, now with a level creator, where you can create the most hardest levels with your own imagination.
Also, if you saw on the Treehouse, Miyamoto was seen playing StarFox for the Wii U, which is still a work in progress, sadly. There are going to be two new Metroids, one of which is for the 3DS and will be a sidescroller exploration of sorts, the other one is for Wii U, which may be a sequel to MP3 or a completely new series, who knows, maybe even Other M? 
Nintendo had also shown footage of Zelda Wii U at E3, nobody can still tell if it's CG or in-game, lol. The other one is for the 3DS, which hasn't been announced yet.