Ideally, there will be very little, if any, weight on the bottom of those ropes.
I used thin bamboo reeds sunk 1 or 2" last year and they held through Irene. I tied the coir right to the bamboo, and then to the trellis. The bine thickness at the base by the time my newports were mature was pretty impressive (which is likely why hurricane winds didn't upset my rinky-dink setup); I don't know whether that is universal to all hop species.
My concerns regarding secure connections are at the top, which will bear the weight (ideally) of thousands of delicious cones.