Far-Fetched Theory regarding the Aspect of War's death.
If I have not misread anything, then it was the Aspect, Pantheon, who tricked Aurelion Sol into wearing the crown, No?
Due to the Lore Rework, Pantheon has since recently been dead, credit to Aatrox for that.
Considering the Crown comes from Pantheon, it isn't too wild (At least not to me) to assume that the crown was sustained by his magic.
Now that he is dead, won't that magic fade with time?
By extension, assuming I am not wrong, that will mean that sometime in the nearer-than-expected future,Aurelion Sol will be free of the Crown, and boy will he be PISSED at Targon.