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One could still ask the question, though.

The way that coding language and deployment/executable language have been tied together (JS for both) has served as a force that pushed everyone toward that single language.

Now that WebAssembly promises to remove that force, will it be a free-for-all, or will other forces push toward standardization on a few languages? And if so, what will those forces be?

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Likely the ones that are on the bandwagon early.

To be even more specific, in the early days now, the main allure of wasm is performance. So the focus will be on languages and toolchains capable of generating optimized native code. Out of those, look at which ones are easy for the developer to set up (both in general, and for wasm) on all popular developer OSes.

So, I'd say that Rust will probably be the biggest beneficiary.

C#/.NET will be in that bandwagon. They have been pushing WebAssembly usage with their Blazor framework.

The performance angle is interesting. Right now JS has lots of mindshare and momentum for obvious reasons, so maybe the things that will take off at first are the ones that help web developers in specific areas where JS performance is not good enough, perhaps graphics for example.

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