It boils down to cost: who’s going to do all the engineering work to re-IP a business, and that without considering lost productivity.

6 is great for the backbone, to relieve the pressure on IPv4. But I have zero need of v6 inside my flat network with a handful of machines, or even in an SMB with perhaps a dozen machines and a few servers.

And that without worrying about app compatibility with v6, maybe tomorrow I need to use something that only works on v4.