Do you mean that DA does not matter, because we still have to invest in x-risks prevention, if we are selfless, or partying if we are selfish? But I could suggest a class of DA with doom very soon, in 20 years. If it true, I have to invest more in prevention of it as it would mean my death? (This version of DA is about the one, where the only intelligent observers from which I am randomly chosen are the observers which knows DA. This class appeared only in 1983 and will probably end in 21 century).