BMW enhances customer satisfaction with their new driveshaft maintenance strategy

[Grumpy Goat]

 it is now anecdotal "knowledge" (?) that dealerships no longer are interested in working on bikes older than 10 years.

True for some dealers but not all.

I am sure that it is a business decision that is not formally established. And I can understand the business decision not to work on these older bikes. Dealerships are not in the hobby business and this fact is often lost on enthusiasts. 

I also understand owners of these older machines who may not have the knowledge and/or experience and/or time/inclination to work on these bikes but need experienced technical support. It is a dilemma no doubt.