Voice driven apps like Siri are one step away from being thought-driven apps, though. Full conscience interfacing is still a pipe dream, but word recognition from brain patterns already has proofs of concept.
I definitely agree, and I do think Siri and the like are very important steps to get there. I just don't think in the short term (relative short term) that these apps can gain enough traction in the wide scope that is championed by some of the proponents for voice apps.