I wouldn't consider that experiment "final". Just because the first one of it's kind didn't prove superiority, I'm sure that's not the last rigid wing sail we'll see on an a-cat.
Certainly not the last one, and Ben Halls attempt was not the first one as well. A wing sail is much easier to build for a homebuilder than making a good soft sail, so yes, good opportunity to see more of them. But it doesn't mean they are faster nor they will be mainstream. Even the fast tri foiler never made it to mainstream...
The next question would be, at which size a wing sail has the opportunity to be better. 20ft, 25ft? I guess rather 25ft, maybe a foiling platform could help to go to smaller size.
