[symboltoproc]

WASM will become available on every major browser and there will be ways to backport the code to older browsers (i.e ASM.js or polyfilling). There are also multiple implementations but the community is not split into different ecosystems.

Why do you think this is not possible again?

[krapp]

I don't think it's impossible, I just think it's not worth the effort. Other languages won't add any functionality that javascript doesn't already provide, or that isn't already served by languages compiling to javascript. It only adds unnecessary complexity to an already messy ecosystem.