It would be neat to see each language get a functionality subset defined that transpilation can smoothly translate from one language to another. The code itself

It would be neat to see each language get a functionality subset defined that transpilation can smoothly translate from one language to another. The code itself wouldn't even have to be stored as one language, but rather in an intermediate representation. I like the idea of shared VMs like Truffle and LLVM, but they really don't fix the problem of allowing developers with disparate backgrounds and preferences collaborate.