Imagine wii speak using a walkie talkie, and it could be done too.
That was my hope in Tcon when Wii speak was announced. To see if people would work better together with the ability to comunicate properly. Weird thing is Wii speak seems to make team work worse than not using it.
I suppose when you can hear a player. Their pride is at stake so they don't like being told what to do. Where as without Wiispeak. Players have no choice to accept the choice a team mate makes and be wise to it.