I’m not under the impression it would unseat PNG anytime soon, but “we have a current standard” isn’t a good argument against it. As images get higher and higher quality, it’s going to increase the total size of images. And we are going to hit a point where it matters.
This sounds so much like the misquoted “640K ought to be enough for anybody” that I honestly can’t take it seriously. There’s a reason new algorithms, formats and hardware are developed and released, because they improve upon the previous and generally improve things.
People don't need to give a shit, you just need websites and servers and applications to produce and convert images to the new format and the rest will happen "by itself'
It should be pretty much invisible to the users themselvea