[aerohead]

A neighbor has been following Tesla.
Evidently, when the Superchargers are used, the cars are 'interrogated' and all data is transmitted to Tesla Motors.
From this 'telemetry,' it looks like the average Tesla pack will go 1-million miles.
The motors use exclusive, proprietary, silicon-nitride bearings built by SKF, under license from Tesla Motors.
The inverter power transistors are water-cooled alongside the motors.
If an owner/ leasee attempts to abuse the cars, the software initiates default thermal-management protocols to protect hardware at all cost.
It would appear that 100,000-mile 'ratings' are very conservative, and the 'actuality' of Tesla ownership will far exceed some prognostications.
I don't own one, it's unlikely that I ever will. Sandy Munro's ( Munro Associates ) benchmarking of Tesla's products prompted him to become an investor. They are currently the 'gold-standard' for EVs.