There've been various attempts at this over the years, but it's really orthogonal to changes to the language itself.

Also, check out the SharedMemory objects[1] in 3.8. For my own use cases, this goes a long way toward making me no longer care about the GIL. I'd rather work on multiprocessing code than multithreaded code any time, and if you can easily share objects across processes, then the GIL isn't relevant to anything I'm working on.

[1] https://docs.python.org/3/library/multiprocessing.shared_mem...