Batteries are about 30% of the price of a full car, which is a lot, but significantly less than 100%. You definitely have an incentive to replace them instead of the full car.

To replace most of them, you need to unscrew the 4 big bolts that hold it, remove the dead one, put a new one in and rescrew the 4 big bolts. This is made difficult by the 700kg that the batteries weigh, but is doable if you have the equipment to lift and move heavy things.

Your issue is Tesla. Tesla has an absurd and dangerous battery design to make their models as flat as possible. I will not list the reasons why Tesla should not be used as a reference

I am not sure why you are stating that only the rich can charge at home, it is much cheaper than charging at a station. Fast chargers do sometimes have a queue issue, but it’s not as bad as it would be at a gas station with three lanes. They’re not converting gas stations to charging stations, they’re adding chargers to parkings that can charge dozens of car in parallel. And you won’t use them often because it’s so pricey.