Of course it's possible. Then all that's left to figure out is... 1. Make it work really well across a vast array of voices, accents, and background noise. 2

Of course it's possible. Then all that's left to figure out is... 1. Make it work really well across a vast array of voices, accents, and background noise. 2. Make is easy to add new features to, in order to keep up with the competition. 3. Mass produce it at a price people will pay. 4. Have a viable business model. Do these simple things and you'll be a very, very rich person.