It won't happen overnight... but...
Fortunately it will eventually happen, ie., the collection of 70's and the new 80's era piston aircraft will get recycled if not because of regulation but because leaded AVGAS will no longer be available, and small turbine aircraft with actually useful modern avionics will replace them. At last.
4 or 5 ex-operators who have had to suspend their own AOCs.
YPDN ? Why did they do that ?
Getting back to the point, why
did Ausjet finally shut it's doors ? Old man Lamb died of cancer in 2015(?), did his son take over and not do so well ?