No to the first question. (The major manufacturers would not hold back if they saw a significant demand in some particular category.)

No to the second question. (There's no such thing as the "fastest boat possible," and the manufacturers cannot afford to get into a one-upsmanship war for something that only a few people both desire and can actually afford to buy.)

Also, no manufacturer is going to commission a design for a super-fast boat unless they are prepared to start building it right now. Things are changing too fast in the cat world, and designers are expensive. So it's not like you are going to pay for a design and "keep it on your drawing board" for a year or two and then build it when the time is right. Last year's design may be obsolete this year.

I think the Formula 18 class is probably the best thing that has happened for the catamaran manufacturers since the 1970's.