I think you're right....
But, I also think it goes in phases. Sometimes personalities drive people away. Sometimes life. Sometimes it just ebbs and flows.
I learn a lot from here, then I drift off to other hobbies, my tank goes on autopilot.... Then something drags me back, and I'm 100% on the tank. Either it doesn't look great, a new toy, a new species, something...
I know a few people on here outside of this hobby; I know I'm not alone in this one. It'll get dead-er in Summer. Trust me. We'll all be out playing with our fair-weather toys.