I mean the sort that tries to make sure that everything possible is done to ensure the safety of the participants. E.g. halos (and many other things) in F1 cars, helmets in baseball, minimizing crosswinds in ski flying, etc..

For Elfstedentocht this could mean making sure the ice is 15cms thick along the entire track, and only starting it if you are 100% sure that this is guaranteed. I would question whether the organization in the past was that strict, or the ice thickness could be as accurately and quickly measured along the entire track as today.

Regulations and what risks are deemed acceptable for sporting events change all the time and have led to huge alterations and the end of certain recurring events in a lot of sports. So (partially) independent from climate change, safety concerns might just cause the end of Elfstedentocht.