Mart,
I totally agree that twin main rotors (or perhaps an even number of main rotors
) is the future.
The question of Rotorcraft vs PropRotor, and the sub-questions related to which configuration in each of the above two categories is optimal will probably depend on the specific applications for the craft, plus what future technological advancements come about.
IMHO, the coaxial-ABC is a step in the right direction but it is inferior to other twin-rotor alternatives. Maybe we will eventually find out why the coaxial-ABC was rejected from the VHL completion.
Dave