[kalleboo]

What's the source for that number?

I'd assume that when you have IPv6, the majority of your traffic (in bytes) will be IPv6 simply because all the CDNs and big video services do support IPv6.

Once my router at home crashed in a way that IPv4 stopped working but IPv6 kept on working and it was actually kind hard to figure out what went wrong because so much of the internet still worked fine.