They're trying!
Dan Kaufman, the lead game designer of Wii first-person shooter The Conduit, has said that he hopes to include voice chat in multiplayer. "We are exploring the possibility for voice chat," Kaufman said in a QA posted on the game's official website. "It is too early to make any promises along these lines, but we agree it could make the game even better!"
To state the obvious, the main problem with voice chat on the Wii is there isn't a microphone to chat into. We'd assume then that The Conduit would have to ship with a microphone peripheral to do it. And you'd have to somehow get that past Nintendo.
Kaufman also said the game will include three competitive multiplayer online modes, a single-player experience that would cater to several types of first person shooter players, and would only include one "mini-game."
