Being ignorant of texting and choosing not to use texting are two very different things.

I personally believe that most adults are far too busy (unfortunately), for the mindless chatter that makes up a large porting of texting. Those adults who need to use texting, simply use it less than teenagers. Those who don't need it, use another form of communications: voice, email, IM, etc.

or use email, if async comms is desired?

Maybe Apple should ban the phone application in the iPhone since users are currently able to communicate bad words.