Nobody I know, and maybe this is self-selection, likes making phone calls. Nobody I know likes receiving phone calls. In fact, at home I never even though about hooking up a phone when I moved 5 years ago. At work, when we moved offices 3 years ago, we never even hooked up the PBX.
The number one voice use I have for my cell phone is the kids' school: 3-4 times a week, one of their computers calls and usually leaves me a voicemail, which Google (badly, but good enough) translates to text. In short: They are sending me voice SMSes. :-)
I loved Asterisk 20 years ago. It was insanely cool stuff. But I mostly live in a different world now.
I find phone calls are still better for conducting complex business - not everything can (or should) be scripted using a form, and a phone call sometimes is much more efficient than chat or email.
Video chat would be even better in some cases, but there's no standardized infrastructure for this. And even then, outside a corporate environment that has dedicated video conferencing rooms on both ends of the call, a phone call is often simpler.
Less people, I think, use Asterix directly these days simply because SaaS/PaaS offerings like Twilio (which is probably built on Asterix, for all I know) cover a lot of use cases. But that's only a guess!