Iaon,
You are quite correct, it will not be the lift generator that will be the stunning breakthrough, but rather the power source. This has been true for all aviation breakthroughs.
The Wrights made an engine at 10 lbs per HP, and that achievement alone was enough to make them famous, even had full 3 axis control waited a few years.
The helo itself had to wait until engines came closer to 1 lb/HP, since Igor Sikorsky's 1939 rotor was almost as efficient as his 1909 rotor and also todays rotors (in the hover.) The spread between the hover efficiency is from the first helo to today is about 20%, while power plant weight efficiency has gone up by a factor of 100.
The turbine engine made the tilt rotor possible, with 10 HP per pound.
What Moller needs is a turbine's power to weight (in a very small package), but a piston's fuel efficiency, a tall order. Beamed energy with electric motors is certainly a possibility sometime in the future, but that break through will give all boats a lift, and helos will really get efficient by that route!
None of this gives Moller any credit, he knows the technical facts that we are bandying about, has known for decades, but he never mentions it to the press or investors when he should. He turns hope into nice houses and impressive business cards, I am afraid.