So far they [Clarke orbit sats] have all been successfully put in parking orbits at the end of their life but an explosion in one of these congested spots would be a real pain. Any debris is going to stay there pretty much for ever.
Not quite forever since satellites in Clarke orbits with 20 year life expectancies need fuel to maintain position.
They need fuel to maintain an exact position (they naturally drift back and forth slightly along their orbit due to perturbations) and to put in a parking orbit at the end of life. But without fuel they would stay in roughly the same orbit just drifting along it.
There is currently a Fox TV sat that died and everybody else keeps having to move out of the way of, burning fuel as they do.
A collision in the relatively crowded space in GSO above the equator over the USA / Europe / Japan footprint parking lots would be a real nightmare. No small debris from there is going to drift down into the atmosphere anytime soon.
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