I don't like Facebook at all. It isn't the best place to develop a marketing business. Now everyone go on Instagram to create and promote any businesses they want. Facebook became sort of a news channel and has nothing to do with business. Instagram is completely another story. It is a powerful business generation if it is promoted properly. One of the tricks to get a higher rank is to know how to buy instagram likes, followers, views and comments. Overall, I highly advise you to use Instagram instead Facebook for your business.
Most probably, this could happen. According to my personnel experiences, most of my FRIENDS are trying to avoid Facebook saying it wastes their time. Likewise, people around the world may be trying to avoid it.So, it might be dying gradually