I think the current batch of forthcoming games will be enough to raise 3DS' sales for a good time. And probably getting releases on a constant flow will helpo the console.
Still, for the successor of DS, Nintendo needs to do something more (important) than just bringing games to the core gamers. I think what would really help sales would be a meaningful redesgin in 3DS' aesthetics; something that separates it from DS Lite design. Other thing would be a 3D screen that allows it to be viewed no matter the distance and angle. The 3DS screen is a bit "fragile" in that regard. A sudden change and you are viewing 2 images.
Third thing needed would be games for the casual and non gamer crowd. Trying to repeat what DS did probably won`t help, as Nintendogs+Cats showed. If i`m not mistaken, sequels to games that appeal to those kind of gamers tend to not do so good - but i could be wrong.
I think that if Nintendo pulls this off next year than 3DS might take off.
