"The Hobby Is Dying"
Parts of the hobby are expanding and others are shrinking. As an example, eventually small blocks and gen3's will be more common than b motors. The surplus of blocks will eventually dry up and folks will have to either change platforms or buy an aftermarket block.
Three random reasons why I don't see the hobby dying:
1) Follow Holley product development and get back to me.
2) People still hotrod A model Fords almost 100 years after they were produced.
3) Although the male population has thinned in the gearhead department we see more female presence than ever. I see more daughters helping out than sons at the track.