[guyomes]

An interface based on voice only has an issue: people tend to not live alone. As children they live with their parents. As adult, many want to live with a significant other.

Having somebody else in the house speaking out loud each time they want infos from the internet could become annoying.

Apart from having a mind reading device, I don't see so far a solution to this problem better than text input with a physical keyboard or a virtual keyboard on the device.