It could be 'five to ten years' before the world finally drags itself away from IPv4

Happy 8th (or 9th) 'launch day' birthday, IPv6. Your daddy ain't dead yet

IPv4 is here to stay with us for a good few years yet, reckons the the Réseaux IP Européens Network Coordination Centre's (RIPE NCC) public policy manager, eight years after IPv6 was supposed to replace it.…

via The Register - Data Centre: Networks
https://go.theregister.com/feed/www.theregister.com/2020/06/05/ipv4_v_ipv6/