I remember a class I had in geology. This was awhile back but I remember the professor who had a pretty big background as a consultant to the oil industry stating the same thing. Something along the lines of if you have a finite energy source, and considering that energy sources changed over time, the idea is to use all of it you have while
1)It is profitable
2)Use that money to invest in new technology
3)Be a leader in new tech so you still control the energy market
This was back in nineties