Even if it's easier to obfusfate WebAssembly, does that matter? If you run the 2MB+ JS libraries in se today through uglify.js it becomes almost impossible to understand the macrostructure just by reading the code.

It's only through dynamic tools that we can even begin to understand minified JS today. Those are actually quite excellent: just try by starting the react or relay tools on facebook.

That ecosystem is hopefully not changing, so what remains is simply that the format is now binary. I agree that that makes me somewhat uncomfortable but realistically it doesn't really change anything.