But here's the rub - who still uses audio calls? Its a point of deminishing intelligence. That's like saying that 80% of all 8-tracks are now in 1970 cars (as a statement in 2014). Its just not relevant.
Uh, essentially everyone? I have a small VoIP company and we were handling around a billion calls a week. You have a really terrible selection bias if you think people aren't using audio calls. In fact, audio calls are on the RISE because of easy and cheap international calling. We have clients that have customers that literally leave their phones open to their families 8 hours a day. Just on and walking around the house.
