Yeah I don't see a nuclear war happening as it would be a lose/lose for everyone involved. We have military bases, attack submarines and warships located all around the globe. If we were attacked we would still be able to retaliate even if our entire country were wiped out.
We also have powerful allies with similar capabilities. If a nuclear war was going to happen...it would have happened 40-50 years ago. Now countries have too many overlapping interests and the stakes are far too high.
Im into preparedness more for short term crises...not highly unlikely forever life changing ones. I don't think anyone can really prepare for those anyway.
In recent history we have survived two world wars, several economic meltdowns including the Great Depression, lost a president, Vietnam, Iraq, Afghanistan, Osama Bin Laden, ISIS, LA riots, Katrina, 911....and we're still standing strong.
Conflict is a natural part of life and will occasionally arise. We will continue to overcome like we always do.