Deja Vu

My personal opinion: no, because WASM was made for fast, low-level code, which is not needed on regular websites. I actually just found this in the WASM design FAQ, and I want to share it with you (source)

Is WebAssembly trying to replace JavaScript?

No! WebAssembly is designed to be a complement to, not replacement of, JavaScript. While WebAssembly will, over time, allow many languages to be compiled to the Web, JavaScript has an incredible amount of momentum and will remain the single, privileged (as described above) dynamic language of the Web. Furthermore, it is expected that JavaScript and WebAssembly will be used together in a number of configurations:

• Whole, compiled C++ apps that leverage JavaScript to glue things together.

• HTML/CSS/JavaScript UI around a main WebAssembly-controlled center canvas, allowing developers to leverage the power of web frameworks to build accessible, web-native-feeling experiences.

• Mostly HTML/CSS/JavaScript app with a few high-performance WebAssembly modules (e.g., graphing, simulation, image/sound/video processing, visualization, animation, compression, etc., examples which we can already see in asm.js today) allowing developers to reuse popular WebAssembly libraries just like JavaScript libraries today.

• When WebAssembly gains the ability to access garbage-collected objects , those objects will be shared with JavaScript, and not live in a walled-off world of their own.

Not particularly soon; and probably not for everything.