The biggest problem SL faces as a communications technology is the unappealing light it has been portrayed in in Hollywood and the resulting image "non-SLers" gain from these shows. I know first hand because I was one of them. I think a lot of people are hesitant to join worlds such as SL because they are afraid that they too will end up with a stalker or worse. There are a lot of skeptics out there, and I think that unless Linden Lab makes more effort to put SL in a more positive, less "serial-killer" type light then it will slowly begin to die out.
So please Linden Lab! Get on this! God forbid millions of successful 30 somethings lose their escape from the hectic business world! They NEED Second Life!!