3DS is going to do very well, but you still have to keep current market trends in mind.
I don't think it'll affect system unit sales, but every focus group I've seen has still shown iPod Touch as the #1 requested/gamed on device for the younger segments (11-16, millennial) and with Android starting to make gaming strides, I think you'll start seeing a larger division for software.
3DS may start to see a more 'Nintendo-console' like sales division with Nintendo titles and franchised titles doing really well but lesser known or third party ports may start to suffer. Hard to say and hear, but with prices of 3DS software/hardware going up, and quality of cheap competitive titles increasing, you can't completely ignore stated purchase intent and expect a sustained, booming market out the door for everyone.
Anecdote time! My 12 year old cousin who is one of the biggest gamers I know hasn't even heard of the 3DS yet. Him and all his friends play iOS games at school/bus, and then he's always on Xbox after school. Granted him and his friends don't spend a lot of time on the internet, but NoA better start some broader messaging for 3DS soon.