Personally I don't know why the he11 they have not done it already. The traditionalist theory is complete bull.
Lets think about the tradition of air cooled motors... fits right up there with drum brakes, kick start, and oil leaks. I for one don't miss any of those traditions.
I like my twin piston ABS brakes, electronic cruise control, remote locking key fob, and my closed loop fuel injection. Now that we have closed loop fuel injection the missing link to better performance and better gas mileage and longer lasting engines is to make them run at controlled temperatures just like the modern cars. Bring on the radiator already!
Mopar, Chevy, Ford, they all get it. Modern cars that look like the cool old muscle cars. If I could have an old Camaro or Mustang or Charger that would be outstanding, but if I was going to use it for everyday driving give me the modern version.
Come on Harley give us the modern version and finish it so it doesn't take another $1000 after purchase so it doesn't burn itself up.