I think this concept would still be quite fun to watch for an experienced glider pilot. I would love to watch or compete! To spectators, I think it would be very exciting as they can understand the concept of a short race and the visuals are impressive. Nothing about gliders is more impressive to newbies than high speed low passes and a zoom to land. To spectators, this competition format will look, quite simply, like this below. Once they see that exciting part of the sport, they might, just maybe...., become a bit interested in the rest of it!?

http://youtu.be/DxbyDwe1_tk