It is a valid question. While the abdication of Queen Beatrix isn't necessarily the best guidepost because the law on this sort of issue varies from country to country (compare the Netherlands, where the heir apparent succeeds, to the UK, where Edward VIII had to disqualify all his descendants if he'd had any), it might still provide a useful guidepost. I do think Wikipedia can take some time to hash this out, however, because until the conclave elects the next pope it's not an issue that would cause significant confusion.