Personally I feel the long term outlook is not good. We've already had a number of near misses, even though the number of countries with nuclear arsenals is likely as low as it will ever be, and no nuclear armed state has yet gone through a serious civil or genuinely existential state of war to my knowledge. At least the number of warheads is way down since the Cold war. There's no real end in sight though. We just have to keep getting lucky until we're probably an interstellar civilization to be reasonably free of a nuclear self-extinction risk.