As I said earlier, I believe time will correct all of this.
In my 20s I rode Japanese sport bikes. I know many of us here used to. Never thought about a Harley. About age 32, I bought a Heritage and was on my way. Now I find the thought of riding 400 plus miles all hunched over and scrunched on a sport bike so unappealing. Aging joints and ligaments tell me so. I just got back from the Ouray GTG, and at my age, (closer to 60), there is no way I could have ridden a sport bike through 4 Utah national parks, and then hiked trails. So when the current crop of 20 something "hipsters" get older, and maybe wiser, those still riding will become HDs target group. At that point it is up to the MoCo to find a way to lure them away from buying another comfortable touring bike like BMW, Goldwing, Victory or Indian. As for buying power, those older riders who can afford it will buy new HDs. Those who can't will buy used HDs or used Goldwings, or BMWs.
All that said, there is something we HD riders can do, and that is invite owners of other brands to ride with us. Over the decades the attitude of "If you don't ride a Harley, than you ain't chit" has painted us all with a broad brush. That coupled with the stigma of reliability issues may be a factor in folks not wanting to buy an HD. The greatest marketing strategy lies not within colors, paint, and a engine that goes "potato,..potato,...potato. It lies within us, the flesh and blood riders. Once they see that we are closer to "Grandfathers Of Arthritis" than "Sons Of Anarchy", they may make their next bike a Harley.
Hey,....how'd I get on top this soap box?