Nintendo will release updates to fix such things for the console.
What about hardware problems? Then again, it's already been out for months in Japan, right? Minor fixes already applied? You're talking about software.
I already have a DSi, I'm not spending more money for some gimmicky 3D thing.
I'm ignoring the gimmick of 3D. I want it more for major software updates and such. A Wii-Like Messaging system appeals so much to me. Helps align gaming times and all without having to leave the system. Not to mention all the general things.
We've been talking for a while about trading my sisters DS Lite (when she finds it) for money for 3DS. Then she gets my DSi.