> 5 years might be too short for everyone to dredge up all that C code, update it, test it, and call it mature. Developers are lazy. Most people will just do n

> 5 years might be too short for everyone to dredge up all that C code, update it, test it, and call it mature. Developers are lazy. Most people will just do nothing until, 5 years from now, some blog post will go "oh, next month we switch noGil as default, good luck!". At that point everyone will scramble, rush out buggy releases, and spend 5 years finding all the problems.