If it's a "better electron" (which I think it is, amongst other things) then it will certainly be used for a lot of "web technology only" apps. There are just so many of them, the other end of the spectrum "rust app with some ui built on html" is extremely rare compared to that.
My first contact with a tauri app is cinny desktop (matrix client) and it's an absolute joy to use. The project source is hardly more than a reference to the source of the web version and some configuration files that make a PWA manifest seem elaborate by comparison.
Tauri is more like a framework/GUI toolkit for Rust apps.