I think they should be extremely cautious with these new fangled, water cooled engines.
Because they will loose their targeted lemmings who will only own & ride the traditional dated HD bike.
Like I always say...I would buy a Harley or even an Indian...IF they had a decent engineer.
Harley is in the business of selling tradition and image. The air cooled, push rod, single pin crank V twin engine is their signature. They should never stop building that.
BMW and Ducati have signature engines, too. That hasn't stopped them from progressing.