I have not noticed it wearing...yet. The board gasket is right there so maybe that's taking some of the wear? A tape type line would be better for that I guess, but so far, so good on the dyneema.
It only gets yanked a couple of times per race, and there is that little indented well on top of the hull, where the flat top of the board recesses into, so it's not really going over the hull at a hard 90 degree angle, more like two 45's and the second one (in the actual dagger slot) has the top gasket there for protection.