Maybe, but it seems like a bad idea to invest in Python 2 (which is teaching is ended of life) just to get parallelism when there are other programming languages that have great concurrency stories and a bright future. That said, if PyPy3 ditches the GIL, let me know!
Yeah, "not relevant to many people" is a wildly false claim. If it were anywhere near true, we wouldn't see the level of Python 3 support that we have in the major packages (95.8%).