Firearms are cheap and easy labor to procure, true enhanced survival probability requires harder physical labor, intelligence, study, devotion, and sacrifice of current desires.
Even I will admit that there is a need for means to defend oneself. I kind of disagree that they are cheap in price, and easy labor to procure in a SHTF scenario, if that is what you are indicating.
I agree with the intelligence mention, and I get your meaning of "study" in that context, the rest kind of seems like random thoughts. Harder physical labor for example seems like you are pulling a rabbit out of your hat. An intelligent, 'studied' (educated) man could lift a couple of thousand pounds by himself with the help of science, pullies, rope, counter weights, and levers for leveraging. I know as I have done this while working for my grandfather's moving business
your "True enhanced survival probability" actually requires a combination of Luck, intelligence, skill, perseverance, sacrifice, but those are useless w/o the willingness to achieve your goal no matter what/how. & there lies the true question. Can you do what is needed to survive no matter what?
Don't bother answering that last question, as truth be told, you won't know that answer until the situation is thrown at you. Based on my own past, I tend to be in that category of doing whatever it takes to, many years have past.. Am I that same person as I was back then. I can only assume I could, but in reality, there is no way of knowing if that is still the case until it happens to be knocking at my front door.