I could just be that the I-20 market in Europe dried up. Nacra stepped out of the F20 class to form their own I-20 strickt SMOD class. I'm still not convinced this move was a wise one on their part. It killed the Hobie Fox which is probably a thing they thought advantagious (although the Fox was already very much on its knees) but from then onwards they had to support the class and market on their own. The French are not at all interested in 20 footers. The Germans never took to the F20 as other EU nations unlike UK and Netherlands. However both these nations are indeed gravitating strongly to F18; have been doing so for years. Especially after the F18 Worlds in NL a few years back. One can buy I-20's overhere secondhand for very attractive prices. Lots on offer only few takers; I doubt many new boats are sold. I think the US market has contracted for them as well.
All in all this may all just be a market development coming back to bite them.
Wouter