The chance that any of the tin foil/tupperware "modern" trainers like the Eurostar or P92 is going to still be making a living with 20 K + hrs is IMHO; zero.
I've noticed the value of 1950s cars (actually almost anything before the design by government era, pre-1972 or so) is going up at a very, very steep rate. There's a reason for that - because they are better for people who buy them as a lasting investment, for their weekend enjoyment. There's a good analogy to aviation, I think, minus the price appreciation. I call that a gift
Chasing disposable designs is a costly disease in life generally, but one that some have looked at closely and decided not to catch.