Sure, it should work if you get good voice recognition software and use a headset mic (for consistency and ambient isolation). I've seen people use voice control for all sorts of things.... never as a game controller, but there's no reason it shouldn't work.
Unfortunately I haven't kept up with the field that much, and I don't know what the current best bang-for-buck software is. The good stuff used to be pretty expensive (I think IBM was one of the early outfits offering this), but maybe it's cheaper now.
Check out this video I ran across recently -- it's a demo of a touchscreen table with voice command, running a Warcraft III game:
http://media.gear.ign.com/articles/6...41/vids_1.html
I could see that being a lot of fun with a game like MTW or RTW.
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