If Dean is a demon now than he will see demons as they are - their real forms, real faces, I mean. So does this work for the rest of the supernatural world too? The next time he meets Castiel, will he see the vessel or will he see Cas’ true form?
Dang it, you’re probably right. =/ I still want it though…
But since the writers tend to forget about basically every detail and lore from seasons 1-5, I wouldn’t be surprised if this happened, so there’s still hope :D