Come to think of it I had a C Clip come out once at 100mph, this destroyed the Universal joint, ie the needle rollers turned into paste with the grease, there was a horrible vibration and the alloy bellhousing fractured badly, all this was after the engineering shop modified the shaft, and I failed to check it when I installed it.........!
I havent read any articles on driveshaft failure, but I wouldn't think there is any need to cover the U/
Js, as normally when they are worn or break the needles and cross get all munched up, and I assume if the cross comes out all together its the actual D/S that causes any problems, but I could emagine a huge whip and boom if under a drag racing situation!
The old cars with the enclosed D/S were very safe, and when modern D/S's came out I guess there was skepticism on the safety of them! Run a hoop and fit a cover of 14- 16 gauge metal close over the top half of the shaft!