I think no, Facebook as long life because Facebook is smart enough, and see where they need to make changes. Even the BNBR rules used here would make a difference. I see a lot of teens using it still, to organize their political marches and to express their input on political issues. Believe me, teens know grandpa's and grandma's vote too and want ALL eyes on what needs to be said. Besides, it's a “lets be friends” site, and not just questions and answers. And you have private message with video chat and are able to post 500 pictures of your puppy. I realize theres other “fun” sites out there too, but I can see Facebook making changes to improve their face too, more appealing to teens as well. Its well established already, not trying to come out as another “new site”. They definitley have started on these changes too. They could change their symbol too . Older folks wouldn't be put out if they did that. I think they will figure it out.

That why I say Facebook has long life.