While I don't wanna see him become a Raid Boss, as I see him as too interesting a character, I have to agree with this. After all we've given him, & things like his apparent possession when he consumed the heart of Lei Shen (Was that what happens? stupid RNG & those tablets....) means he could be a force to be reckoned with, & he's only gonna get more powerful as he ages.
But I think if he's right about the return of the Legion, we'll need him.