I'd love to be able to use a bit more type-y Go such as Borgo, and have a Pythonesque dynamic scripting language that latches onto it effortlessly.
Dynamic typing is great for exploratory work, whether that's ML research or developing new features for a web app. But it would be great to be able to morph it over time into a more specified strongly typed language without having to refactor loads of stuff.
Like building out of clay and firing the parts you are happy with.
Could even have a three step - Python-esque -> Go/Java-esque -> Rust/C++esque.