Some additional information:
Here is a link for USA owners to file a complaint with the NHTSA (National Highway Safety Administration) https://www-odi.nhtsa.dot.gov/VehicleComplaint/
If enough complaints are filed it may spur Ducati to do a voluntary recall rather than be forced to do so.
Additionally, post this thread to your Facebook or other social media pages and tweet about it if you use twitter etc. The more public the information is the more likely Ducati will take more action that a telephone call to see if they can make us like them more. If enough bad press gets out and sales volume starts to drop maybe Ducati will take notice. I also agree that if there is no manufacturer resolution of the defect (other than to telephone me and essentially tell me to not rock the boat) then I will source an aftermarket rotor (and not from any company associated with Ducati).
As of now my next bike will NOT be a Ducati. Unfortunate indeed as I had planned on adding a Multi to the garage.