Skills repairing/salvaging things will become invaluable again. I'm thinking electronics, appliances, clothing, etc. At some point people aren't going to be able to simply throw away something and buy the latest gadget as a replacement. Keeping the machines and goods that already exist in your local area alive will be very good mid term, as you will probably save a good deal of money maintaining the things you have, as well as perhaps making money fixing and salvaging things for the countless people that will not have these sorts of repair skills.

Skills creating new things, mainly in terms of things like machining, metalwork, and carpentry work will also be pretty important. Hell, they're quite useful even now and can be pretty great hobbies.