Janet,
I was a coordinator/administrator/marketer at 2 different sites over the past 7 yrs. We had 16,000 registered members when I retired from it in December. While some topics did get repeated often, we really never ran out of things to talk about. I doubt we will here either.
I don't think we've hardly touched on everyones hobbies, their goals, or their passions. Every day there's news to discuss, new discoveries, etc. I really think we can keep this site alive and growing indefinitely if everyone feels as you and I do about it.
(and I suspect they do)