I fully expect 3DS to cannibalize Wii support, especially in Japan. Of course, it also looks like it's cannibalizing PSP, PS3 and 360 support also.
If Nintendo was smart, I think they'd try to set up an easy "multiplatform" R&D ecosystem, where they could encourage doing both 3DS/Wii multiplatform simultaneously, similar to what the industry's done with 360/PS3/PC. That way they'd at least ensure key content still made it to Wii (MH3G, IE Break, etc) while possibly getting some additional games on Wii (KH? MGS? RE?) that wouldn't have come otherwise.







