User blog:TheGreatLegend/Arthur's Death

I was watching some series 1 Merlin episodes when I thought of something on "The Begining of the End"

It's Modred's first appearance and The Great Dragon say's that the boy will one day kill arthur if he he is not killed. Before I thought Arthur would die on the last episode or something by Modred but then I wondered wouldn't the people who write Merlin make Modred die? As Arthur is too much of a main character? And what about Merlin's destiny? If Arthur dies Merlin's destiny won't come true which I don't think will happen. Thinking of this I wondered why everyone is saying that Arthur's going to die, what are your thoughts?