I'm just starting adding a list of the members of the (US) National Academy of Engineering. we have only about 1% of them covered by articles. there are dozens of fields like that where we haven't even begun on the obvious. We have probably a similar coverage for pre 1990 US state legislators in almost all states.
Additionally, for creative work, for politics, for important products, there will always be subjects for new articles. People are not going to stop doing new things.
What we need is people. We will get them when we stop discouraging new ones by our general hostile way of talking, and our focus on deletion rather than improvement for new articles. Anyone who comes to write even a facebook-type article on themselves is a potential recruit, if talked to carefully. If they're willing to go to the trouble of writing, and brave enough to do so, they can be guided to find a proper subject.
David Goodman, Ph.D, M.L.S. http://en.wikipedia.org/wiki/User_talk:DGG