People's interests change,their priorities change , their health and well being change, their finances change,their jobs change,their locations change, their desire change just to name a few of the reasons numbers may have dropped.
Blaming social media for the lack of new boaters is horse sh!t grow up.
Lifes about having a giggle and bream fishing is no different, to take it anymore seriously just does your head in,relax and enjoy whats offered and move on.
The guys are doing a fantastic job and without them you'd have nothing, so just enjoy what they're prepared to offer and have some fun both on and off the water.