I'm not gonna be surprised if PS4 passes 50M by the end of Sept 2016; in fact, a SLIM model will most probably be released by 1st of Sept 2016, and PS4 will Pass the 50M mark, my forecast.
”Every great dream begins with a dreamer. Always remember, you have within you the strength, the patience, and the passion to reach for the stars to change the world.”
Harriet Tubman.