Newer Canon mirrorless cameras now support HEIF (R5 and R6), and I think newer Sony ones will as well, so the groundswell might be starting in the higher-end.

Newer Canon mirrorless cameras now support HEIF (R5 and R6), and I think newer Sony ones will as well, so the groundswell might be starting in the higher-end. But iPhones have defaulted to using HEIF for years now I think, and no browser (even Safari) supports the format yet, so...