Here's the thing: Python, especially 3.6, is such a well rounded language that all other major limitations have IMO been solved already. In my view the GIL is the main one left, and reason to pause and think whether python is a good idea at the start of a project. Removing it is therefore worth it, and would also give a nice additional incentive for everyone to switch to python 3.x, so we don't have to keep on maintaining 2.7 with the same code (i.e. the worst of both worlds).

Certainly not worth it for one person to tackle the GIL, but a million people running into it a few times in 5 years, and I think it's economical.