This morning I was reading about Emotiv - they are using brain waves to make devices take action. Someone could wear a headset and "will" a car, wheelchair or a number of other items to move forward. No levers, no knobs. It's thought waves interpreted by software that enables an inanimate object to take action.
There are a number of uses for this listed on TechCrunch and at the Emotiv site. It could be used in video games, to help paraplegics and the disabled, to help individuals who have seizures to relax and focus. Those uses would be industry game changers. However, there are some uses of this technology I personally find a little devious such as market research and interrogations. It's just invasive. And those uses are based on the notion of people not telling the truth and making this into some type of lie-detector test. That's not using technology to enhance society.
However, what if there was a way to use brain waves to use your mobile phone? Maybe you enter a security code using your own brain waves - some emotional response combination? What if you could do that for your bank account? Talk about a security feature!
This still has a way to go before it is mainstream, but will there still be room for gestures and voice technology? I think those will always be available. The challenge with brain waves is that it could be misused and become an intrusive technology in the "wrong hands." Personally, I would prefer to use gestures and voice commands when interacting with a device. I wouldn't want a device to have access to all of my thoughts and feelings (especially with all of this NSA/Snowden business going on). However, for those who cannot use their voice or hands - this is a great solution to give them the life they deserve. Maybe it will develop so those who cannot communicate today (mute, speech impediment, etc.) could do so tomorrow? What a great advancement!