IFMU
I agree in principle. Igor Sikorsky flew the Grand, a 4 engine, 5 ton machine in 1913. Sixty years later that vehicle evolved into the 747. Similarly, he flew the VS-300 in 1939. 35 years later Sikorsky flew the 35 ton CH-53E. However, some subsets of rotorcraft technology may approach physical limits due to power requirements or material limitations. To draw a slightly different analogy, I believe that the VTOL Harrier and F-35 are approaching practical limits for turbo-fan thrust born flight. Co-axial rotor systems may have just such a boundary.
Jack