Maybe don’t talk about stuff you don’t have any experience with then. Many ISP products are carrying Ethernet frames (metro Ethernet, the fabric at an exchange) or are even just leasing fiber.
In order to force IPv6 and ensure nobody is using IPv4, you absolutely are putting laws on what goes over those Ethernet frames.
Presumably the proposed law is about normal Internet service. If you have Internet then you have IP6. If you don't then what you have isn't Internet. If your company cannot provide IP6 then you are not an internet service provider because you do not provide Internet service.
Why do people immediately assume that any possible regulation will be the stupidest possible regulation? Corporate brainwashing?
In order to force IPv6 and ensure nobody is using IPv4, you absolutely are putting laws on what goes over those Ethernet frames.