All recreational activities will mature and decline over time. When a new sport is starting there is the excitement of exploration - being the first to do something. Snow skiing, waterskiing, skateboarding, wind surfing, kiteboarding, etc., and most other non-contact sports have or will go through this. Early adopters tend to move on once it gets popular. It is not nearly as much fun for the competitive person to enter the field of a mature sport where the margin of victory is fractions of a percentage point. Three-event got there in the '90's. Wakeboarding and snowboarding a couple of years ago. Wakesurfing a long time ago. There will be smaller cycles over time - typically personality or technology related. Think of Tony Hawk and what he did for skateboarding - now that sport is declining a bit, again.
Like in our sport, there will be a core of committed participants. The main growth is face-to-face and not in the media. People get involved because of positive exposure - it is fun. Keeping it fun is the challenge. Unfortunately, we, USA Waterski types, have almost gone out of way to suck the fun out of it.
Best advice - just ride and share the joy.