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.