Maybe in Europe, but not in the U.S.
A few years back at the US peak we had :
H14
H16
H17
TheMightyHobie18
H18SX
H20
H21
H. trifoiler
Tiger
Fox (although this died rather quickly)
FX-one
Wave
Getaway
Bravo
14 different designs/classes that I could write down in the span of 30 seconds.
Most of them have been terminated now that is true, but that was also sort of necessary.
Wouter