This is another vision that is wide open for interpretation.  What exactly is a chink in the wall?  My sense of it is that this is the Black Gate controlled by the greenseer at Whitetree. Bran describes the face as someone who has been kept alive of a thousand years.  Jon describes the weirwood at Whitetree as old and powerful.  So I question whether the blue flower or rose as Jorah describes it, refers to Bran.  Whether or not he is actually meant to replace Bloodraven or the