iirc mikrotik supports netflow. that's how i account for proto balance. FWIW, owing to the nature of residential traffic, I've typically seen high (60-70% of traffic) as v6.
Yeah, if the stream platform CDNs support IPv6 (Do they? is there a site that lists it?) then the vast majority of residential traffic will be IPv6.
This is exactly why this isn't a good way to measure ipv6 adoption. For example, youtube supports ipv6; if you spend all day watching youtube, 80%+ of your traffic will be ipv6.