I view potty time even more rigorously than arriving on time. If you can't do your business in a reasonable time frame, you deserve to play with John E.
We seem to be sliding between two, actually three extremes. DQ em all, because you know, nothing ever happens that couldn't have been controlled, and it's unfair, and someone will take advantage if it isn't harsh enough.
The rule as is wasn't meant to be perfect, it was meant to punish those who couldn't be timely, while not booting them. Yes, I know that is hard to believe/accept, but the PDGA actually thought someone might have a real accident and didn't want to be too punitive. It actually accomplishes it's goals. A rational change that still accomplishes those goals and brings equity across brackets is fine. Especially one that is easily managed bracket to bracket.
I ran cross country through Jr. High, High School, and club during college and grad school. Rule number one, dump before you run. I've managed to translate that to disc golf quite well.