The issue with betting on oil as I see it is; you need to pick who isn't going bankrupt first of all. Also yes, oil has to go back up but there are plenty of smart people who think this is accelerates the long term fall of oil (I don't have an opinion here) so there is not the upside that there always has been. The ideas being plenty of jobs are never going back to full time in office work.
There's certainly money to be made, Im just not smart enough/experienced enough to figure out where.
Boeing is another weird one, airlines all over the world are permanently retiring planes that are working perfectly, and they arent doing it so they can spend billions replacing them. Feels like betting on their military contracts to make up for a lot of lost market.
I think long term, the savings on buying the big credit card companies is long term, free easy money.