Good site. It is fair to comment that helicopters are undergoing a period of development, not unlike the pace which produced supersonic fixed wings in the 60s. Interesting to see how far the technology can be pushed.
I would imagine that once the performance envelope is opened up, efficiency will become the next drive. This may well produce numbers which make helicopters look more competetive for short-haul passenger flights, focusing on point-to-point.
Interesting times.
Mart