I'd agree with you if you'd replace "phone" with "communications device." I'm not convinced that voice calls will remain the dominant interpersonal communicati

I'd agree with you if you'd replace "phone" with "communications device." I'm not convinced that voice calls will remain the dominant interpersonal communication medium once we're a (human) generation into ubiquitous smartphone deployment. Anecdotally, I'm sure we all know people who just use their "phone" as an email/SMS platform, and I could easily imagine a near future where palmtop devices primarily do various forms of text messaging, and then additional addons (perhaps a headset and a voice plan) are required to make voice calls over the legacy PSTN.