Did you state that Vita is doing bad because of 3D or something else?  Vita doesn't have 3D

The app itself isn't the important thing. The effect that Pokédex 3D Pro, Dream Radar (which isn't so much an app as a mini-game), and the aforementioned 3DS-exclusive functions have together is making it clear that the best console to play B2/W2 on is the 3DS. We don't have to discuss "how big" an effect these things together will have on 3DS hardware sales: I just pointed out that they received an 18% boost the week of B2/W2's release in Japan.

DS received a larger boost percentage-wise, but in actuality DS hardware sales only increased by about 700 units over the previous week, while 3DS hardware sales increased by about 11,000 units, in spite of the recent XL announcement. Again, if it weren't for the release of Pokémon that week, 3DS sales likely would have dropped -- and they were sustained through the next week, likely in part due to the strong release of Culdcept, but perhaps more likely due to the continued strong sales (over 400k) of Black and White 2.

I propose that 3DS hardware will receive at LEAST a 25% boost in America and Europe the week of B2/W2's release in those regions. It's not anywhere near the enormous boost the DS received from the release of Black and White, but this isn't Black and White.

Point is, don't rush the 3DS Pokémon games. They'll come. They don't have to come in the console's first year. Check it out: the GBA launched in America in '01, Crystal came out about a month later, Ruby and Sapphire came out in '03. The DS launched in '04, Emerald came out in '05, Diamond and Pearl came out in '07. What's happening here in 2012 is business as usual for GameFreak.