In Belgium we're up to 49.5% of Google traffic over IPv6, which is pretty impressive. All major ISP's have IPv6 enabled in a dual-stack setup right now. This works because almost all of them provide an all-in-one modem/router/access point, all remotely managed, so it's easy to just flick a switch on the ISP end and magically have everything go over IPv6.

What's holding back further progress is mostly people with their own NAT routers/DHCP that's not set up for IPv6, or company networks where the transition isn't planned. That's going to change very, very slowly indeed.