There is no leadership in SecondLife now. There was a leader, long time ago. I believe Phillip was his name. :-) Then he left and we got a new leader for a while. Then he left and Phillip HAD TO come back for a while and point the ship in the right direction. Then Phillip left again -- he's totally bored with SecondLife and want to do other fun things now -- and we got another new guy as the leader. What's his name? Do we ever hear a single word from the "leader" of Second Life? No blog, no nothing. What's he do all day at Linden Labs?
The only thing going on in Second Life now is the viewer wars. Old viewer, viewer 2, Phoenix, etc. Now when someone asks me for help in SL that's the first question I ask -- what viewer are you using. If you say the one I'm using, I can help -- otherwise you get no help from me. Sad, but I can't tell you what to click on if I don't use it every day.
No leadership, no sense of direction, no unified viewer experience for all users. That's my big three reasons for no growth in SecondLife.