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Ceramic brakes were never designed for longevity.
Brakes slow the car by converting the kinetic energy to heat energy, the faster you are travelling when braking, the harder you brake and the more often you brake (ie track driving) the more heat energy is generated. The function of ceramic brakes is to dissipate this heat quicker.
The material of the ceramic rotors do this by holding the heat at the surface, and because you are applying the same amount of heat energy to only a small proportion of the rotor the temperatures can rise quite quickly.
The increased temperature is what causes the carbon in the discs to oxidise, reducing their weight and strength.
If the temperature of the discs is kept low (street driving) then they should last the life of the vehicle.
The more time the discs are kept at high temperatures and the higher the temperature the more their life is reduced.
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