I was gonna say - I already have a language with the expressivity of Scheme, the convenience of Python, and the performance of C - it's called "Chez Scheme". Why isn't it popular? Because A) the performant implementation was proprietary until relatively recently, and B) it's less "batteries included" and more "that drawer in your house full of batteries, most of which are dead". There's a great language in there, but it lacks the tooling and social structures for popularity.