User blog comment:GabbiLeFay/The End/@comment-5102537-20121215144620/@comment-5674726-20121215145517

''The Five Kingdoms were already united by Uther in "Sweet Dreams". No idea what more kingdoms belong to the great Albion anyway.''

There was peace in Uther's time so, unless Merlin thinks that Arthur is going to end up being High King or something - not necessarily a good thing, since it's unlikely that Odin, for one, would willingly surrender sovereignity to Arthur - there's very little left for Arthur to achieve in terms of making a peaceful Albion. At this point, he appears to be working to make Albion as peaceful as it was in Uther's time rather than improving the situation he inherited.

As for Morgana, I'd say that even if Merlin revealed himself rather than speaking to her as Emrys, she has no reason to consider him trustworthy. Even if she believes that he believes in Arthur's destiny, it doesn't mean that she'll believe that he is right to have such faith in Kilgharrah's predictions, especially if he's trying to convince her of Arthur's supposed destiny when Arthur is dead.