That’s not really an honest comparison though, and also kind of simply doesn’t matter.

Most vehicles will have some expensive component fail well before the engine, and after ~10 years almost any major replacement will cost $5k or more. My suspension gave out at year 8 and it would have cost me $5k to repair my Ford valued at $5k. Who’s going to want to spend that - on an engine or otherwise - on a 15+ year old car unless it’s a particularly well regarded model by enthusiasts? The average consumer doesn’t care.

The average consumer wants a new car after a decade simply for new features (like sensors or safety), change of lifestyle (like going from a sedan to a van for kids or an SUV to a sports car), or even simply styling and aesthetic. If the battery lasts 5+ years than the average consumer wants the car in the first place, it won’t matter.

Not to mention that in the coming years, the price of replacing battery packs will likely drop, while the price of replacing engines may likely increase, as OEMs ramp down engine production and ramp up battery production.