Rick,
I agree with what you said but it seems the general consensus is that it would be the last nail in the coffin for the N20 class. I'm not really sure if I agree with that but I'm trying to be a team player with my buddies who race them as well.
I've been messing around with a different spinn and am just now getting the bugs worked out. I had one made that is the same dimensions as the N20 spinn but a more updated cut. At first I hated it. Not going to mention where I ran it. Next big race, we got a little better with it. Now it's pretty stretched out but flying very nicely. I have another season left in it I believe and will get another one made from the same guy but with a few small changes. Where we're running in a Nacra 20 class, I'll continue to run EP sails.