Cochlear implants and sub-lingual vocalizing. Spectacle HUDs.(or implanted).
I don't want to listen to a voice mail much less some conversation in my head. It's much faster for me to just read a text. Auditory comm. has a symetric encoding/decoding time burden. Whereas text shifts the time burden to the encode side. Listening to what someone says has a much higher mental bandwidth requirement (at least for me) than reading as well.
If the world economy doesn't collapse completely, something will replace texting as we know it. In ten years, the little universal gesture for texting (holding an imaginary smartphone and twiddling the thumbs) will not be recognizable by the average teenager.
I'd disagree almost completely. Texting will remain common until there's some sort of brain-machine interface, and there will still be folks like myself who don't want their stream of consciousness going out to all the world. I'd probably go so far as to say in 10 years it'll be more common with the increase of hearing loss due to the mp3 players in the ears 24/7.