Thus far, my thoughts go in three different directions and require the length of three stories to tell, and none of those stories involve Merlin being alone after Arthur dies. *g* But - if I had to say what I think would happen in canon, I'd agree Merlin isn't going to go to Camelot, other than to deliver the news of Arthur's death to Gwen personally and say goodbye to Gaius. He's going to wander and learn and grieve and be alone.

Aaaaaaaaaand that's why I'm writing three fix-its. Heh.