Rode a friends Hayabusa, very smooth and shall we say... ahh... "snappy" motor too.
Guys who can deal with the lay down seating, put bags on them and go sport touring already. I'm too ancient to deal with the riding position.
The only thing that stops me from wanting a Suzuki/Busa based ST, is that the Busa is already right at the best weight (500 and change) that a truly great Sport-tourer should be at. They'll likely make it larger and heavier like their competition. If it's 600++lbs, I wouldn't personally consider purchasing. I'd still have the ST if it wasn't for it's girth, and girth is why I didn't consider a new Connie. It's also why I'll likely never own a wing.
For those who don't mind the weight at all though, the Busa felt light side to side like the Kaw ZX14 did at the Cycle show. Suzuki could certainly build a desirable contender from that engine should they care to sit down and think it through well.
Competition from Suzuki would either make Honda drop out or sit up and finally start thinking straight about an update to their ST.
Didn't Papa Honda pass on some years ago??? He was personally interested in racing and breed improvement. I'm not sure Honda has the same spirit going now days. I could be wrong, but I think they certainly sat on the same ST too many years already. Not that it isn't a great bike, it is. Certainly better than the original Connie that sat still for so many years. However Honda is capable of, and there is room for, refinement in the bike IMO.
As to GS style bike. I'd like to see it (even though I wouldn't buy one, again because of girth) UNLESS they also made a smaller GS style bike. If they took the SV/Strom motors to do it, those bikes "could" be great in the dirt.
Suzuki does know how to do dirt well. Their dirt bikes were always good handlers in the latter years. I'd love to see an SV motored 650 GS style bike from them, actually made FOR doing some real dirt adventuring. That 650 would already be all the motor & then some, that anyone could need-need in the dirt, and easily adequate for even goodly stretches of slab. The SV was 352lbs. dry, so they could make it reasonable weight. THAT I would buy if I lived in the mid-West, maybe even buy it without living in the mid-West. What a fire road machine that could be.
Then again I'm quirky and no one need consider my buying habits when assessing a market. Heck I ride a 250cc Ninja around sometimes, I even go on overnight trips with it, not the norm.