Well, I wouldn't worry about the F20 class. Once you guys all get fat, you'll be back!

The N20 offers it all to me.... A boat I can be fast on that still allows me to wolf down that greasy reubin sandwich and beer while I'm "training"...
When my team gets too heavy to be competitive for N20? Hmmm, the ARC 22 has a ring to it... I think I can even mount a grill on that thing....
Class or not, the majority of cats out there today are good, solid boats with a core of loyal followers. Rock-stars, and those wanting to be, will move from fleet to fleet.
Having only been on the multihull scene for about 6 years, I'd be interested to see if the rock stars as a group ever go back to a fleet they left in the past (other than Olympic class boats)...