I agree that a rigid wing would be an improvement in some area of the sport.
The main issues I see are that the current wings have a huge leading edge which would limit the top speed. Current wings are pretty fragile and are prone to bladder failure - and then being stranded out in the depths.
I've posted a link to Kai Lenny's vid of him trying to hit some high speeds using a non-conventional wing.
The drawback is that putting a similar designed wing together (to this prototype) will mean it might be complicated. It would obviously need to float. And having a rigid structure may cause problems if you hit it with yourself or your board. It probably wouldnt be as compact as the current bladder versions. But the other potential benefit I see is that if you stick your foil through the canopy, you just order in a new canopy, stretch it over the frame and away you go again. Cheap option to renew your wing.
www.google.com/search?q=kai+lenny+wingfoiling+spped&rlz=1C1GCEW_enAU1075AU1075&oq=kai+lenny+wingfoiling+spped&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIJCAEQIRgKGKABMgkIAhAhGAoYoAHSAQg3NzM5ajBqN6gCALACAA&sourceid=chrome&ie=UTF-8#fpstate=ive&vld=cid:5ce67842,vid:UYu9JjoAHeU,st:0