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> I don't know if adding a new language would/will help emacs or not but it's _plausible_ something like that would work.

I don't think it is plausible. Emacs extensibility and power stems from the fact you can see and change almost everything. You can add advice, i.e. modify, any function there is. And you can inspect any object that exists in the heap. If you add another language into the mix, these two languages either have to share an object/data structure model or they have to bridge them somehow. In vim you have plugins that add new commands, or hook into some callbacks. But in emacs you can extend every third-party functionality with another third-party library. Fragmenting the ecosystem into two language camps would probably diminish this advantage.