Originally Posted by Valiant
That would make sense. Human Cain was turned to a demon, blade would not let him die. Now Dean has all of those powers and gifts. He is basically on par with Crowley.
To balance this Sam will need powers which hopefully leads them to leading both sides and then a quality spin off.
So I just re-watched it over lunch. Crowley actually says that its the mark that wouldn't let Cain go, not the blade.