Im not sure it would undermine the F18 class. What it could do is make the class that is chosen NOT the choice of F18 sailors. Eg over the last 10 years or so we have seen the Inter 18 develop into the Nacra 18 and now the Infusion. With the boat becoming Olympic that development would stop. On the flip side of this the Tiger has basically not changed...but if it were not allowed to by being constrained to being one design would it still be competitive in an F18 fleet in say 5 years time. However IMHO the Tornado at the moment fits the bill...now if it could be made cheaper more countries would race it. I honestly feel that the perceived expence of a Tornado is what puts many countries off camapigning them.