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What qualifies a physicist to discuss the immortality of a civilization?
Here, indulge.
An per your question: the same that qualifies you or me, which is being alive and capable of observe and extrapolate possible outcomes through thinking.
You'd be surprised by most people's ability to do so.
It's sad how stupid people are full of certainty while the intelligent are always full of doubt.
That is the biggest concern we should have.
Then why are we taking their opinion over our own?
Typically, when people cite something like that, they defer to an expert in that field. In this case, maybe an anthropologist? There's nothing in the training to be a physicist that prepares them to understand the early stages of civilizations forming, let alone is longevity.
Have you read the article?