Board Thread:Questions and Answers/@comment-110.33.239.213-20121226023324/@comment-86.156.220.85-20200731220300

Merlin is the last remaining part of "Albion,", so perhaps when he needs Arthur most is when Arthur will return. Merlin could get something wrong happening with his magic which could threaten the world somehow but the presence of his once and future boyfriend calms his magic down. Also Merlin doesn't need a girl, he needs Arthur lolol those two were in love - the show-writer confirmed them being in love in the finale episode commentary.

Or another idea I have is that at some point the "albion" will be attacked by some kind of magically made immortal army which makes Albion turn into a sort of zombie apocalypse wasteland and Exalibur is the only weapon that can defeat the zombies because that weapon is the only weapon to defeat the living dead and that weapon is with Arthur in the lake. Also the zombies have torn people apart and countries are non-existent and it's up to Arthur to save the world with Exalibur and his legendary leadership.

Or it could be global warming and Merlin feels like he shouldn't interfere with humanity because he never has but then Arthur returns and tells him to get his shit together and save the world from global warming with his magic. And then Arthur leads the world into becoming a greener place because all the leaders we have nowadays aren't taking global warming seriously and are too selfish and care too much about economics instead of the planet but Arthur is the once and future King and cares about the people and land and stops global warming and idk what could be a greater threat to humanity than global warming.