Umm, what fleet would you switch to? Some are running parallel campaigns in Nacra 17's, but none have sold their F18's to do so AFAIK.

The F16 is a great boat for its intended use, mixed teams, lighter sailors and those that like to single hand. When you start bumping up near the weight range of the F18, it's IMO a more competitive platform; more boats, more competitive sailors and more regattas.