In my codebase at work there are a few cases where code is (poorly duplicated) that would benefit from a proper generic solution. But I don’t expect go2 to significantly reduce our codebase size, even if we replaced the aforementioned components.

I agree that some form of static typing is critical to scale a codebase, or an ecosystem. Let’s also not forget the importance of a packaging system with robust version management. Go modules and proxy.golang.org are also critical to Go’s success at (code) scale.