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hm.. I’d assume that the kind of people who download images from websites know about the new formats? And if you double click the downloaded file, it opens in a program that can display it, right?

First assumption: definitely not, though my proposed solution would not work for people who don't know what the formats are at all. Second assumption: oh no, no no no, search "I hate webp" to get a taste of how lack of WebP support in most OSes and apps make people super angry.

People who download images from web pages (including Google image search) need a format to be supported in at least three apps: the browser, their OS's file explorer, and the app where they're trying to use the file (Photoshop, Krita, Google Slides, etc.). Oftentimes there's a fourth or fifth app.