Thingsfallapart
Superstar
The wall had special magic that kept the white walkers out, but since one of WW touched Bran, they can go wherever he goes. Remember when he was in the cave with the 3 eyed raven, and the WW touched Bran in one of his visions, and after that the WW were able to get into the cave? I think it's the same thing with the wall.I think without the dragon they would have had to actually climb it.If they never would've got a dragon they never would've got past the wall though right?