Hybrids will always be at least a fmall fraction of the economic realities of the automotive industry. Most notably:
1. Perception - Does this car add any perceived benefit to myself (smug factor)
2. Gas - Higher gas prices will influnce total cost of ownership (TCO), and for those who bother to calculate it, a rise / reduction in fuel costs should factor into demand
3. Electricity - When you pug in at home, your home electrical costs rise, so in order to maintain TCO benefits, electrical costs should rise slower than gasoline
4. Economies of scale - Producing significant portions of EV's should theoretically improve the unit cost to produce them, and ultimately allow for prices to drop improving TCO
5. Subsidies - TCO +/-
6. Resource scarcity - EV in large scales are generally a new concept for most of the world, so its taxing demand on more materials that classical auto's haven't which drives up price
If in 10 years the TCO of EV's were 1/10th of traditional gas burners, we'd be looking back and say just how quaint that ol' gas technology really was. That said, there'd be a lot more world shifting things to consider if petrolium was no longer a significant driver as an energy source.