Nah, small airplanes are relatively easy to build. Even if we eventually stop large-scale production there'll always be the occasional hobbiest putting a one-seater together.
As long as there are old men there will always be steam trains. They always run on dedicated lines between the hours of 9:15 a.m. And 10:02 a.m. every 5th Thursday unless they cannot be bothered or it's raining.