This is pure nonsense. WebAssembly is no more obscure than asm.js or minified JavaScript. "Binary" versus Unicode-enabled minified and transformed "source" is the same thing.

You can get text out of WebAssembly as well as you can get text out of minified JS.

Further, users don't care about this. It's literally just developers. Open Source / Free Software is a super valid discussion to have, but I highly doubt any non-technical user cares.

Amusingly, pcwalton brought up this discussion recently: https://twitter.com/pcwalton/status/872151997473972224