I dont think Jesse will go ahead and set fire to the house as in the fast forward scene the house doesnt' look like it has been set a light, I think Walk will get there in time or Skyler will walk in..
Maybe Jesse confronts the son about what him and Walter were up to. Or he kills either the son or Skyler, complicating things. If Jesse kills the son, would Hank want anything to do with him as a witness? It could even be out of Hank's hands now.
