They believe that the current nogil approach can allow the vast majority of c-extension packages to adapt with a re-compile, or at worst relatively minor code c

They believe that the current nogil approach can allow the vast majority of c-extension packages to adapt with a re-compile, or at worst relatively minor code changes (they thought it would be ~15 lines for numpy for example). Since c-extension wheels are basically built for single python versions anyways, this is potentially manageable.