That's just the path from the user to the gateway (usually a CDN, rarely the server where a website is hosted). Behind that, pretty much all is IPV4. And there's not reason to change, very few companies exhaust the private address range. But as long as everything behind the first gateway remains ipv4, sysadmins will mostly work with ipv4 and ipv6 will never make a real breakthrough.
I believe even in 10 or 20 years, we'll see ipv6 only on public traffic, anything else (which is much more both in traffic and ips) will remain on ipv4.
I believe even in 10 or 20 years, we'll see ipv6 only on public traffic, anything else (which is much more both in traffic and ips) will remain on ipv4.