I believe that we have stopped expecting growth because our ways of reaching the lost world have become ineffective. Rather than changing ourselves, we stayed the same. As we reached less and less of the world, we simply concluded that the world is not interested in a genuine relationship with the Lord. The fact is many are interested; people have simply been inoculated with our methods, not our message.
People respond to a genuine interest in who they are and what they are about. Ask questions, understand people's passions, spend time in their world and then watch God work.