Why rule out a survival situation? While nuclear missiles would probably just end all life, there are a broad spectrum of other things that can go wrong in the next decade that just take out power grids. It would be good to be ready with more robust technology than GPS-aware microchips, I can see how it could come in handy.
I'm seeing a lot of energy security issues out there, and there are extreme economic pressures all over that could spill out in unexpected ways. There are some profoundly grumpy people out there right now.
I would 100% completely rule it out in survival situations. The probability of making a contact and that contact being of use is very low. There are far more productive uses of your time than bashing brass. I say that as a regular QRP CW operator.
In a survival situation you're better off with VHF/UHF HTs and a tested network of people that you already know who have them and how to use them. And even that is of dubious use.
Some infinitely more likely survival situations involve tooting on a horn or blinking a flashlight.
Survival situations are one of those power law distributions where the odds of one person being in a survival situation at some point in their life are surprisingly high, regardless how unlikely it would be for a couple billion people to simultaneously be in the same survival situation.
Generally CW mode (morse) can be transmitted farther on less power than most other modes, and can be sent and recieved without sophisticated electronics (build your own QRP rig for like $10).
But yeah, there's not a lot of utility, even in rare or hypothetical emergencies. Many other things one could focus on.
I'm seeing a lot of energy security issues out there, and there are extreme economic pressures all over that could spill out in unexpected ways. There are some profoundly grumpy people out there right now.