The only thing that will see the end of these aircraft is the availability of avgas
That will not be a problem shortly. And I expect the availability will be better not worse.
What is more the big turbo engines will do much better, and all engines will be cleaner and less costly to maintain as a result.
A better performing UL avgas is the answer and is almost here.
So, smile, be happy and love your Navvie a lot longer
