Sam, opening everything else besides rudders, daggers, mast, and sails.. what else is left? Parts? That would really piss Nacra off, more so than sails I think. And it's certainly not worth that risk over a few things. You can already make your own rigging.
What Keith said about F18s having developed sails two iterations is something to consider why open sails is so successful. For the most part, since the designs refined to current technology, changes in sail design have been so small that someone going out and buying the latest and greatest isn't a game breaker unless your at the very top of the fleet in which case your willing to part with that money if your competing at that level. But even so it's been a couple years or more since a sail like that has came out. It becomes a continuous cycle that is very advantagous to the life of the class.