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I doubt there's a decline in interest in scientific hobbies as suggested - I think there's more viable fields now, including, for example robotics, computing, etc.
Another thing to consider is if you work full time, then it's often difficult to dedicate yourself to another pursuit beyond the hobby level. For myself, I'd like to do more within Astronomy but I know that the demands on my time are such that I can't dedicate or commit myself to the level I believe necessary. However, I learn what I can now such that I can move into doing more for when I eventually retire.
Perhaps this is where we need to also start looking for recruits? Those that are looking for hobbies, etc as they near (or go into) retirement?
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