Nacra and Hobie probably can compete in the F16 Class; however, they would disenfranchise their existing SMOD classes that are "closely" similar, FX-1 & F17. It is only recently that the F16 class has gained any real momentum and it would have been schizophrenic if they jumped in before now. Frankly, I hear very little hype about the FX-1 & F17 anymore and expect that it is an indication of some F16 surprises in the near future.
Whatever the case, it seems as though formula beachcat racing has a strong appeal for the owner and it is here to stay. Ben Franklin promoted "Join, or Die". It may be applicable.