> There is, after all, ample precedent for this: women have succeeded to the throne on ten previous occasions > [When this comes to pass,] the emperor system, which depends on an unbroken line of male heirs, will collapse. These two statements seem to be in conflict.
> What is striking is that 74% have no objection to the offspring of a woman emperor succeeding to the throne. If this were to happen, it would be an historical first.
Women have succeeded to the throne, but they have been succeeded in turn by offspring of an earlier male emperor. Every emperor (in theory) has been able to trace their ancestry back to the sun goddess through the paternal line.
Tracing ancestry through the maternal line as well would be a significant change.