Now we change the world for everyone and put most of library developers through a valley of desperation for 5 years+, just so that a very few narrow use cases get the benefits they want.
Not a smart move IMHO.
I try to avoid python as much as possible, because I mainly work with Go & C++ and multi-threading with those languages is just better (imho). Bringing python a step forward and making it future proof might be a good thing... Even if this means to break some things? Not sure if dismissing the GIL is the right step, but there is a big performance gap to fix. Or maybe the AI community must move to a better suited language? Having python code in production just feels so wrong. Especially if a rewrite in another language shows the performance gap.
I'm not sure whether the SC has considered alternative approaches but it would be surprising if not
Alas, subinterpreters sound like they could be a feasible solution for many use cases as well.