The most desirable outcome would be where manufacturers could design new aircraft with state of the art materials, engines and avionics instead of using airframes and certifications from the sixties. The cost of entry is so high this inhibites innovation and safety.
Recently a Canadian design that competed with Boeing was blocked by Boeing because it was a competitor. Airbus stepped in to scoop up the newly certified C series and rebrand it an Airbus A220. Not what Boeing wanted.
If the cost of certification is so high and established manufacturers block new entrants the safety and innovation that has been a hallmark of aviation will suffer.
Flying sixties designs with bandaid fixes will be our future and our grandchildrens