There are already a bunch of awesome community implementations of the MVP WebAssembly spec [0][1][2]. Meanwhile, the V8 [3], SpiderMonkey [4], Chakra [5], and JSC [6] teams have all started work on implementing wasm in actual browser engines.
We've still got a long ways to go, but it's much nearer than 10+ years!
[0]: https://github.com/WebAssembly/wasm-jit-prototype [1]: https://github.com/WebAssembly/wasmint [2]: https://github.com/WebAssembly/wasm-aot-prototype [3]: https://github.com/WebAssembly/v8-native-prototype [4]: http://hg.mozilla.org/mozilla-central/file/ca086f9ef8bc/js/s... [5]: http://blogs.msdn.com/b/mikeholman/archive/2015/06/17/workin... [6]: https://bugs.webkit.org/show_bug.cgi?id=146064
(Disclaimer: I'm a Google Chrome PM contributing to the WebAssembly project)