The first guys to set up a motor controller exchange service for them. May do really well financially is a guess. They use a three phase motor basically off of a dc supply. So the dc has to be converted to a form of three phase and the output current controlled. This is done basically all electronically. Of course manufacturers may engineer them as totally unable to be accessed internally for servicing. At the electrical current level needed they may be expensive. Although I notice they are favoring higher levels of voltage operation to keep them cheaper. Plus the need for heavy wiring is also diminished.

Cheaper is only a relative term though. I have a feeling they will be fairly expensive. I do not suspect the motors themselves will see a high rate of failure in comparison. They have no brushes and do not have to operate at extremes.
I also suspect that north America will be the last of the developed countries to see them in numbers. For a slew of reasons.

I think one European country just hit the thirty percent of saturation area already though. Chinese citizens get somewhere from a half million to perhaps three quarter of a million units this year. Five hundred thousand to be produced by Vokswagon in China. None for export this year. Wages for Chinese workers are up seven fold in the last five to ten year period. They are now able to buy what they produce. So their export component has also declined massively from 70 percent of production to 40 percent and will probably continue to shrink. Of all production of all goods. They are also the most likely country to improve on battery technology. .