I think having a commitment that strong to a dangerous activity should factor into whether you have kids in the first place. Maybe it doesn't make the answer an automatic "no", but I think one has to really think through one's decision to create a person who will have a disproportionate risk of major trauma in their early life and should have an extremely clear contingency plan for the child's care by someone who is genuinely psychologically and materially prepared for that eventuality. I think that to do less than that would be negligence—it might be a common type of negligence, easily obscured by romanticism about bold endeavors, but it is certainly not taking care.