Since that Buell is owned by Harley-Davidson and Harley is controlling the money, you're not going to see a lot of research and development to be spent for hotrodding an engine for the Buells. Buell sales are not exactly spectacular so HD isn't going to spend the extra bucks (even though they can afford it). Say what you will about The Motor Company, they do know how to make money.
America's motorcycling pride isn't about making the fastest bikes any more. America's motorcycling pride is about "coolness" and "attitude", hence HD is selling like hot cakes to all of those people who grew up wanna be like Peter Fonda's Easy Rider or playing Billy Badass Hell's Angels marauders.
The supposedly hardcore riders claim that Harleys are made for long distance cruising. Pray tell then why is it that when I do interstate ridings I usually see Goldwings and BMW touring bikes (and a red Aprilia
Back in the days the Sportster was made to combat British sport bikes. The VR1000 made a brief appearance that made my heart fluttered and then HD took a stake to it like I was a vampire.
Believe it or not, Americans do want a competitive American sport bike. But the only joint that has the moolah to do so won't make it.
I'm not a mechanical engineer so I can't say with certainty, but I'm sure that with R&D even the 45-degree aircool V-twin can be made to be highly competitive. No, it will never put out the oomph of the watercooled V-twin or the watercooled I-4, but it can be made competitive. Just look at the BMW R1200S: 1200-cc aircooled flat twin churning out 122-hp and 82-lbft of torque. Kicking ass against the watercooled V-twin and competitive against the watercooled I-4. Who had ever heard of that? But BMW just placed mid-pack in the Le Mans endurance racing against Japanese and Italian liter I-4s. Hell, it even beat out the Ducati 1098 and the MV Agusta F4 1000.
All it takes is commitment and money from Harley-Davidson to make Buell great. But you won't see it.