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The case wear caused by metal impeller contact results in both reduced coolant flow rates, which if severe enough can cause overheating issues, and it can also cause fine metal to clog smaller coolant passages with the same outcome.
How long it takes to cause severe damage is relative to how badly the pump is wobbling and how often the car is driven in this condition. I have not heard of noise complaints related to this wear, but that can also be because the pump bearing is making so much noise that the impeller related sound is masked.
Basically, anything extraneous should be kept out of the cooling system, and the composite impeller bits can cause similar issues. Shops usually resort to reverse flow flushing the cooling system to try to dislodge impeller bits. If it is really bad, engine disassembly and ultrasonic cleaning baths are the next step.
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