Why would you think that? The oil industry is just one part of our economy. There is more capital investment in Apple right now than there is in any oil company, for example. As oil stocks dwindle two things will happen: -Former oil investors will bail out of the company doing poorly and invest in new companies that are doing better -New investors will choose more profitable companies This is nothing new and has been going on for a few centuries here. There isn't now, nor is EROEI constant. It changes with time. That's why oil will soon become a less than ideal investment.