For some reason air cooled engines are harder to meet emissions on (this is why Suzuki dumped its awesome air cooled 1200 for the 1250 in the big Bandit)
Also, if you'll notice, Duc stopped selling the big Streetfighter, and I think the small one is soon to follow. So the top Monster, like the old S4R, will take its place
Kind of sad to me as while I do like Monsters, I def prefer the old ones for their clean look, as well as the Streetfighter for its out of this world Borg look... the liquid cooled Monsters never did it for me. I think the Streetfighters, specifically the 1098s, are gonna become collectors items very soon.