You'd think, but they don't work it that way. There are Teslas on the road that are on their 3rd motor in less than 100k miles. Apparently they're built to be swapped out like modules, with the batteries being more robust. One guy is on his 14th motor and 4th battery, though he's the current record holder for sheer mileage on the car. It seems like it depends a lot on the type of driving you're doing.