Hi Cindy:
I think that you are correct that the chief cause of most glider kiting accidents is glider pilot distraction. And, in my experience there are two major causes of glider pilot distraction on tow: 1) canopy opening in flight 2) suction cup mounted gadgets (Go-Pros, Ipads, Nooks, etc.) coming unstuck and falling somewhere in the cockpit). The former can be addressed by adherence to checklists. The latter I think should be banned entirely in favor of hard mounted device holders. My club has done that.
Roy