Ummm... no. I am not going to dictate a spreadsheet worth of data even if the voice recognition were 100% (which it's not). I'm not going to try to dictate an IM in the middle of a meeting. I'm not going to dictate anything within listening distance of my boss or a customer that might be less than complementary. And so on...

I think when we get fMRI sensors that fit on our head and we can "think" a sheet that's a possibility. But I see no business situation where voice beats typing when I have both available to me.