It's not working well at the moment, but that is not evidence that EVs are a non-starter. Video cassette recorders were outrageously expensive when they were first launched; that was very much not the case after a few years on the market.
Don't be ridiculous, manufacturers have always been interested in improving the efficiency of their engines, particularly after the oil crises of 1973 and 1979. Around this time, consumers started demanding better fuel economy, and governments started mandating it.
Yes, rail is different to cars, although some trains are now incorporating battery technology. However, the fact remains that they are mechanically simpler, and therefore more reliable and durable. They don't have to lug around an engine, turbocharger, intercooler, alternator, air filtration system, cooler group, exhaust system, silencer and fuel tanks, only the electric motors and associated electrical equipment.
Yes, I think an EV will be just as energy efficient after 10-15 years as it was when new. The battery may require some attention, or replacement, but the vehicle will still be serviceable.
The electric motors in cars can probably do a million miles or more. Again, with trains, the electric motors are sometimes removed from old trains and fitted to their replacements!