From a dollars and cents point of view, it seems that there are more Middleweight bikes out there than Unlimited. If Unlimited machines are used then I would venture to say that the middleweight guys won't even bother try. I would be curious to see how many middleweight riders there are now and how many of them will not race F40 with the inclusion of the Unlimited bike.
Right now for us folks in Florida the F40 race gets a little hairy with what appears to be a higher occurence of red flags. Large field, bigger bikes, to me means more incidents can happen.
I guess though if it an all new class within the F40 group that may be a different story.
Mark