Yes, please do so. I suggest you start with Vaclav Smil. The error in energy density thinking is that it assumes the current centralized model for generation, transmission and use. When you have more, smaller, devices this model breaks down. You clearly can have economic growth on more expensive energy if you are creating more value per unit of energy. Energy density theory in the simplistic form you present it has been debunked. Changes in energy density are important, and will have many impacts on the economy and society. Some of these are positive.