Examples of technologies failing to change price/performance:
1) Self driving cars: can you replace people working for less than minimum wage with the expensive hardware and liability related costs? Eventually yes but even airplanes are struggling and that is a far easier problem.
The counter example might be closer to Tesla's auto pilot.
2) DC electrical grid (as implemented by Edison): expensive to transmit over distance relative to AC.
3) Fuel cell cars: the platinum catalysts drove up the price. (There were other factors as well).
Examples of technologies succeeding to change price/performance:
1) Light bulb: factories could be productive even at night. Since most of the costs were fixed, getting more productivity was invaluable.
2) CPU's: Moore's law
3) Solar: Manufacturing costs were the real obstacle, and improved manufacturing and economies of scale led to an economically viable product.
I don't claim to be perfectly right about all these cases but I think they illustrate the gist of what I'm saying.