Can't see that happening any time soon, browsers/users love render speed. If one is concerned about this as an end user, I've seen some extensions that block w

Can't see that happening any time soon, browsers/users love render speed. If one is concerned about this as an end user, I've seen some extensions that block webp and try to request a png/jpg/etc. version from the host. I can't attest to how effective it is as I didn't use it long. But it worked with some of the big image hosting sites like imgur. For me, this was just so I was able to download images in a usable format. Most OSs can't treat webp like normal images, like generating thumbnails or opening a preview app. That was a few years ago though so maybe things have changed.