Board Thread:Series 5 Discussion/@comment-5995315-20130207171053/@comment-5674726-20130209000257

Also in the finale, we discover that the monarch who will lead Camelot in a golden era of peace is Gwen, not Arthur.

The flaw with that is that, even if we assume that Gwen legalised magic - which would lead to another set of problems - there's no way that she would be able to fulfil the part about uniting Albion. It would have been a stretch for the rulers of the other kingdoms to unite under Arthur's rule as some kind of High King or whatever. They'd be much less likely to decide to surrender their sovereignty to a woman, particularly one who was born a commoner.

Even keeping Camelot at peace would be a huge struggle, given their weakened position. They had no allies fighting with them against the Saxons, so it's highly unlikely that they'll have help from other kingdoms when more of them arrive on Albion's shores.