French isn’t mostly spoken by French people, and hasn’t been for a long time now. The language is growing fast, and growing in the fastest-growing areas of the world, particularly sub-Saharan Africa. The latest projection is that French will be spoken by 750 million people by 2050.
http://www.forbes.com/sites/pascalemmanuelgobry/2014/03/21/
http://www.forbes.com/sites/pascalemmanuelgobry/2014/03/21/