What is the parallel drawn regarding the future status of the term 'astronaut' based on historical linguistic change?
Answer
It will diminish in exclusivity as spaceflight becomes routine, similar to 'aeronaut'.
The text predicts that as spaceflight becomes routine and the number of participants increases, the exclusivity of 'astronaut' will diminish, mirroring how 'aeronaut' became irrelevant for routine air passengers after Charles Lindbergh's flight.

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