[subarctic]

Do you have any stats from which you know that adoption is limited? The thing is, you won't necessarily know if an app is using it unless you're deliberately checking the sources in the dev console, so there could be a lot of sites that you're using that have wasm running in your browser without your knowledge.

That being said, one thing that's potentially holding back developer adoption is that, in its current state, wasm is best suited to low-overhead languages like C, C++ and Rust. And then there's the fact that most of the code that runs in the browser is UI code, and it'd be hard to justify writing your frontend in Ruby or Python, which would mean that the browser download a big wasm blob just to write your code, worse performance than JS once it starts running, and a much less stable ecosystem.