It won't be centuries.

starlink satellites are in low orbits and will deorbit in a few years at most if bricked; to stay in orbit, they use ion thrusters to counter drag from the very uppermost reaches of the atmosphere.

https://ai-solutions.com/newsroom/why-starlink-is-lowering-s...

Kessler is much less of a problem at their altitude (480km). Debris has too much drag and would get pulled down too quick to have a sustained Kessler situation. It's possible, but very very unlikely at that altitude.

Stop trying to make Kessler syndrome a thing - it was never a thing, it isn’t a thing, it will never be a thing.

It is just pearl clutching by those too afraid of modern life. Gravity wasn’t a documentary.