prosfilaes
Adventurer
RPGs came out of the make believe games children naturally intuit
Granting that that's true in a sense, so what? The fact that ox head soup comes out of the human habit of eating doesn't tell you whether or not it's still being cooked.
I mentioned mountaneering- but really you can expand my idea to encompass any form of exploration. Let's not belabor the point by trying to niggle on the details.
But I think the details are relevant here. Things we presume are immortal aren't. Hobbies do appear and disappear.
Even if the industry side of these hobbies were to vanish without a trace, the hobbies would persist. And eventually the industry would come back anyway, to fill the needs of these hobbyists.
I don't see how you're supporting this. And I don't see it as a meaningful question; hobby industries are filled with hobbyists trying to make a buck in the field they love. If they're gone, the hobby is gone. If the hobby is there, they're there.