I've wondered how the petroleum industry is or will be dealing with a movement away from their product. If a lot more NG, coal, and wind/solar are used in industry, and hybrid/electric grows a lot in automotive, oil demand is going to decrease. Revenue will drop. The only options are to increase product cost (which will decrease consumption and still drop revenue), or to drop product cost so that consumption remains high.
Disclosure: I'm employed by an oil company and these are my own opinions. I personally hold investments in several oil companies AND TSLA. I'm bullish on both carbon-based fuels and EVs.
Depends on whether you view the problem locally or globally.
The world is using more energy, not less. What I believe you're likely going to see is robust demand for oil, natgas, and yes, coal as the per-capita consumption of energy increases in the developing world. Places like China are building everything from wind farms to coal power plants because their appetite is almost insatiable. The abandonment of nuclear power by many nations (a mistake IMHO, but that's another story) will largely be replaced by NatGas fueled generation in the medium term. We'll also see robust development of renewables globally, but it just won't keep up because the technology of affordable scale today is still carbon based.
More locally and throughout the developed world, things are going the other way. The highest per-capita consumers of energy (i.e. us) are getting more efficient. In British Columbia, people already are consuming less gasoline, for example. Prices have been steadily shifting the vehicle fleet toward more fuel efficient vehicles (smaller vehicles, smaller displacement engines, better engine technology, hybrids, etc.) and people are changing their behaviors toward more transit, combining trips, etc.
EVs are starting to hit the practicality sweet spot, if not the price/practicality sweet spot. They will continue to be luxury items for the time being but this is tech that is starting to tip. I've driven the Leaf as well as the Model S. The Leaf is a nice practical vehicle that's boring. The Model S is the first EV that I could see being close to practical for my life pattern. Both are still luxury items.
So back to your question. Demand continues to rise globally while the era of easy oil is over. Big Oil will be fine (I know many will be disappointed in that). But we're going to see a tremendous amount of change over the next few decades - it's going to be interesting!