I can see a electric vehicle in my future. Short trips, plug in at night. No more oil changes, no more gas station fill ups(gas stations increasingly dangerous) But have never paid more than 20K for any vehicle. Guess Ill just have to wait for a good used one with a new battery. Until then, just drive my diesel VW that gets 50MPG in to the ground. Will be many years Im sure.
Unless abused, a battery may be good to 20 years. Experience is also being gained using remanufactured batteries. Technology is constantly improving so today's batteries should perform better than the graph below. Tesla may perform better than some others.