I can see the goal line drop out changing the way defence is managed very close to the try line. Instead of trying to make sure you keep the ball carrier from crossing the line, pull him on top off a pile of players so the ball is held up. Instead of 5 metre attacking scrum to defend against, you are gaining a defensive clearance kick and defence reset 30 or 40 metres out.
In one of the videos on the WR site, blue two is a couple of metres short of the line and loses the ball forward into "in goal" and the ref gives a goal line drop out, why? Surely the knock on is where the ball is lost, nit where it hits the ground, if this happened on the halfway line and say a 10 gave the ball to the 12 coming on a hard line and it was knocked forward 5-10 metres, no advantage we'd all give the scrum at the point it is lost, not where it lands, so why the difference?