Just my humble oppinion.
Your most important skill would be that that you see with people you dont think of as survivalists; the survivors.
I go to a quite large European city maybe once every two years and I sometimes see homeless people who, in northern scandinavia, are living with their entire lives in a plastic bag. I spoke to a man once who told me he had been homeless for 16 years and only spent a handful of nights in shelters.
Given peak oil, global warming, and debt, not to mention a JIT system that allows for only around two weeks’ worth of food, ammo, medicine, and fuel for towns and cities, definitely anything connected to localization.
I’m going with firearms and self defence, mainly because the rest is useless if you cant defend it. You could build a car and hunt a ton of food, its all pointless if someone can just take it of you. Plus hunting and fishing are easy to learn and so is bushcraft. The mechanical how to knowledge and farming while might be hard can be learnt, I managed to teach myself how to farm pretty easily. The only one other one is first aid, that probably second on the list.