People are wondering why the cost of new GA aircraft is so high.
When Cessna restarted the 172/182 and 206 production lines I was speaking with a Cessna US guy who came out with the first couple inported into Australia. He stated hat 50% of the cost of the Cessnas was the cost of liability insurance for 20 (or may have been 25 years) for that airframe. If you look at production costs for other items and how they have risen, this makes sense. Cessna stated that they could resume production when the GA revitalisation bill was passed in the States that limited liability to 20 years (25?). So a 100% markup on each airframe to pay for this is the cost of the US litigious society.
I can't speak to the rest of the argument on manufacturers not wanting to change the status quo. The only thing I do know is, it was economically feasible it would have been done. I am sure the latest technology could be incorporated into aircraft engine making them more economical, more reliable(?) lighter, etc etc. but if it does not make economic sense then it won't be done.
Cheers
CB