I don’t think that’s a good argument. Money becomes worthless all the time. Like the example Hanh mentioned - 550 million euro worth of francs became worthless. Another example, 1.4 billion dollars worth of “forgotten” reais will return to the Brazilian treasury soon.
That being said, I personally am not in favor of burning the Sprout pool, but I am in favor of deprecating it and figuring out a solution to move funds out of it later if people truly ask for it.