There is no licensing for internet providers and that's a good thing. Most ISPs in the US already provide IPv6. 45% of users access Google over IPv6 and this has been increasing linearly for the last decade: https://www.google.com/intl/en/ipv6/statistics.html
The final barrier is crappy consumer routers with terrible default settings. Not much we can do but wait for these devices to die because the average user won't buy a new one until that happens
> Most ISPs in the US already provide IPv6. 45% of users...
Is that distorted by cellular providers?
I know my wired ISP does not provide IPv6, even when I explicitly asked for it. They do CGNAT for most customers and assign a static IPv4 to anyone who complains (and then try to start charging for it a year later).
The ISP at my previous home was also IPv4 only (although, thankfully, no CGNAT).
Probably a bit, though I have noticed an upward trend in v6 support with ISPs.
When I was using Spectrum, was pleased to find they had (barely-passable) support, SLAAC wasn't a thing IIRC. Google Fiber has done well and so did AT&T's offering
Ok, fair enough. If Spectrum and AT&T both support v6 now (edit: Comcast/Xfinity too!), then that probably does cover a good portion of the wired ISP market.
Last I checked, most of that IPv6 traffic was mobile, and most residential ISPs don't offer IPv6, or if they do in areas, they don't always provide IPv6-ready equipment. We're in a similar situation up here in Canada - adoption is slowly trickling in through mobile networks, but many large ISPs still aren't offering it.
