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.

That reminds me of something I heard way back when they allowed smoking on airlines.

"Having a smoking section in a plane is like having a peeing section in a pool."