What the old man said makes sense... the "demon lord" appeared, did his thing, stole the power in the world... and there is just peace.
Even the turbulence here and there is minimal, with the exception of what is happening in Murooshia, all the instances were limited to Zappa and his apprentices killing other mages.
Even the guessed true intent of the "demon lord" doesn't seem it will lead to all that much difference.