I expect like every audi vw and seat ive seen so far the unit will need replacement.
Maybe you should post this on a bmw forum it maybe teach them to use the handbrake rather than sit with their foot on the brake pedal when in traffic or at lights.
BMW don't have any warranty issues with the indicator LEDs, the owners would never know that they aren't working seeing as they never use them.
As Gryzor says - 30000-50000 hours life is typical for an LED bulb. If you average just 30mph, you're talking 900k miles life - think the engine and body will last that long?