I think the main reason is that there are more options these days for people to explore other hobbies. I never heard of LARPing until a guy I play hurling with quit to do that (both real things). Invite that young person fishing and spend time teaching. I started to get into fly fishing a couple of years ago. I'm by no means an expert, but I try to spend more time teaching what i know. Had several buddies get hooked and enjoy going out. Probably more to do with Beer drinking and away from home, but a victory is a victory.