Things looking up for the Vita, now have more games for it than my....

[MikeRox]

Well, the "spin offs" of the big franchises have done pretty well on Vita.

So yeah, I don't see why a CoD on 3DS wouldn't shift a fair wedge of games and like you say, there's a clear gap in the market. That's why I think Iron Fall will be quite an interesting one to follow. Hopefully the dev will give a rough idea of how well received it's been.

If it does well, it means there is a market for the games on 3DS and they'll have a very competent engine ready for other devs to just buy off them.