I don't think we will ever get the one language that just needs one statement to do anything AS of the language specification. If you have something in mind, where the language gets more capable iteratively by their users, then that is already the state now, we just don't name that a language, this is called software repos. The reason this isn't used solely is a) supply chain risk, which you don't care about with LLMs, and b) that the third-party software often slightly differs from what you want, so while you could use third-party software you choose to still write it yourself.