The biggest cost item is what will the insurance companies consider to
be the likely product liability costs of this new powerplant? Remember
the liability tail is still 18 years, and even this is reset if parts
are replaced. Insurance companies are pretty conservative on
innovation, and for good reasons.

My read on it is that over a long term, the US light aircraft industry
is destined to go overseas where the liability costs of innovation are
less. We'll still have new aircraft (occasionally) but without
additional tort reform in the US, the imported costs will continue to
rise.