IPv4 was meant to be dead within a decade; what's happening with IPv6?

In the early 1990s, internet engineers sounded the alarm: the pool of numeric addresses that identify every device online was not infinite. IPv4, the fourth version of the Internet Protocol, used 32-bit addresses, about 4.3 billion unique numbers, which, at the dawn of the internet, seemed unimaginably large. Yet as the internet exploded in the 1990s and 2000s, experts predicted those addresses would soon run out. A new protocol, IPv6, was devised and hailed as the solution, with exhaustion of IPv4 addresses leading many to expect IPv4's replacement within a decade. Fast-forward to today, fourteen years after IANA exhausted its unassigned pool of IPv4 addresses, and IPv4 is still very much alive, while IPv6 adoption has been a slow uphill climb.