If we're going to switch to a new format, it would preferably support and be good at everything, including animation, lossy, alpha, metadata and color profiles.

What the first graph shows me is that this format is slightly better than WebP in one aspect, ignoring half the other features of it. Considering WebP is already far more ahead in terms of adoption, I'm happy sticking with that instead. It's natively supported in most browser and many graphics softwares, which is the real uphill battle for a new file format.