Everything post wc3 is fan fiction in my eyes but sure.
I am already creating my own universe of warcraft.
I already retconned parts of wc3 
(Arthas no longer being the lich king or undead etc never picked up the sword etc. but his deeds still left him a more… Tyrant path.
for lack of better words.
Like he doesnt aquire frostmourne etc. and isnt corrupted etc. but he does murder Terenas and take lordaeron as a throne and takes his people and sails out in the unknown.