there are ways to fix that. we can find many ways to raise awareness to new members about the existence of the lounge. we can encourage people to participate. there are several popular drug forums that follow the exact same format for many of their social and/or obscure forums to great effect. also, people don't exactly join the lounge at an alarming rate. if you look at the top 20-30 lounge posters 90%+ of those names have always been familiar.
your point is valid though, but it doesn't mean we can't find a way to fix it if it will be a problem. we'll have to find a way to objectively analyze any possible stagnation and tackle it then.
no one has won. this isn't a fight. it's about finding a solution that suits everybody.