Maybe it's a pipe dream, but I'd love to see a project that tries to unify a lot of existing software under one robust, featureful build system, doing a job similar to packaging but with a more invasive method. Because, of course what will happen from there is that, while nearly everyone will grumble that it is not the best build system, they will use it in anger when they want to get their personal projects running. At that point it becomes the defacto standard and we can escape snowflake-build madness.