I disagree. It could only work if the 2 companies operated completely separately.
HD management hates sport bikes. They view them as beginner bikes, and step toward selling them a Hog when they're ready to step up to a "real" motorcycle. That's how they viewed Buell, and MV.
HD being able to successfully manage Ducati would require a major shift in the goals of HD's management...who hate change. It ain't happening.