User blog comment:Merlaa/Pendragons - The Diamond of the Day./@comment-5674726-20121229001036/@comment-5102537-20121229144741

If that's the case, they should have mentioned it somewhere along the way. There were also numerous people being saved by magic which, in the beginning of the show, would have actually meant that others would have to die in exchange but they dropped this subject once and for all.

If Uther had had children with another woman instead of asking for magical help, his heir(s) would have children too. So Im not sure about this balance-thing at all.

If ever, I think that, in case the show runners had dealt with it in a clever way or at all, Arthur was just a tool for the Old Religion because his birth was predetermined. Obviously he wasn't meant to survive at all and wasn't meant to have children. His only purpose was the weird one we saw on the show.