It's not a good idea, can you imagine Dean without Sam, and Sam without Dean !
We already saw some episodes when they aren't together, that's awful ! I forgot the name or the number of the episode, but do you remember when we saw Sam dressed on white with this hard face ? That's had never have to exist ! they need to find another way for the story ! they need to be here for each other.
Maybe in the last season, the story hadn't take a great way but they can up the slope! We need to wait for ! Soon we'll know all the next stories of our cutest guys in the world !