Well that's answering the question, I admitted I was dodging that - my point was that they're not true anyway so we don't even need to theorise what might happe

Well that's answering the question, I admitted I was dodging that - my point was that they're not true anyway so we don't even need to theorise what might happen over generations of reproduction. But perhaps I misunderstood/mis-scoped what was meant by 'immortal'.