To me it seems it has always been our personal and professional responsibility to show up fit for duty. You can create all the regulations in the world and that will not change the fact that some pilots will choose to push the limits and commute into a trip fatigued. You can regulate airlines to require pilots to live in domicile, and some pilots would still show up inadequately rested. It's on us, and even more so, the PIC. The beauty of that responsibility is that it comes with freedom of choice.