I don't think the point of any great books program is to finish and say "You have now read everything of relevance, no need to read anymore." The curricula are

I don't think the point of any great books program is to finish and say "You have now read everything of relevance, no need to read anymore." The curricula are broad and general so that if you have particular interests in a field you are now equipped to read all of the texts you mentioned on your own. If there was a specific "Great Mathematics Books" curriculum perhaps all the ones you mentioned would indeed be required.