I think that the H-D equation is about to demonstrate a parabolic shape, as they've also seemed to have saturated the market, at least in my area.
Fully 2/3 of all used motorcycle sales ads in my state are all for H-D, and we have at least (4) large H-D dealerships in our tiny state of New Hampshire, whereas we've only recently grown to (2) BMW dealers. I think that with the large quantity of used H-Ds, even though some sellers seem to think that these used bikes are worth much more than the price of new ones ("oh, but I've added on aftermarket pipes to make it even louder, and these gay leather handlebar tassles to slap me in the face when I ride", is a common attempt to justify a ridiculous "premium"). I believe that "The Motor Company" is going to have a tougher time selling new bikes at the prices they are asking - there soon won't be enough H-D riders with disposable income to continuously replace their 2 year-old motorcycle with a new one, which also will only get about 3K miles per year put on it.
It seems that there is a veritable surplus of low mileage, high-priced, used H-D bikes around here. If I wanted to get a Harley-Davidson, I'd probably buy a low mileage used bike after bringing the seller back down to reality in his price, instead of shelling out even more $$ for a new bike - there are plenty of low mileage used bikes in my region to choose from. The post AMF-years H-Ds are MUCH better quality machines, but one can also find a number of Japanese bikes that will out-do everything about the H-D except in quality of paint and resale value, and perhaps exhaust system loudness, IMHO. I've certainly seen more H-D bikes broken on the side of the road here than other brands, but that could very well be due to the fact that we seem to have such a high concentration of them. When I was a kid, seeing a H-D was a much more rare event.
It was quoted somewhere that we in New Hampshire of the highest percentage per capita of motorcycles to people in the state. And, I think that the majority of those bikes are all H-Ds, followed closely by Japanese cruisers and sport bikes.