Back in the early 2000's, we were told (by media) we would run out of IPv4 addresses shortly and needed to move to IPv6. Over a decade later and we're still not

Back in the early 2000's, we were told (by media) we would run out of IPv4 addresses shortly and needed to move to IPv6. Over a decade later and we're still not there. Who's actually using IPv6 now and why?