I would not let it dangle since you do not know how long it could get in which it might bend and crease the bine from too much weight. I would somehow find a way to attach it to something. I have a first year Columbus that is already a foot over the top cable at 17' feet and I expect it to continue growing. I will attach it horizontally to keep it going as the hops will continue to form on the upper parts of the bine.
All I ask is three beers apiece for each of my co-workers...I think a man workin outdoors, feels more like a man if he can have a bottle of suds.