Time to make a difficult prediction.
When will PS4 reach the 10 million consoles sold (to customers) milestone?
Things to remember while making the prediction:
Sony is currently selling The Last of Us Remastered and a bundle that may boost the sales.
Gamescom announcements in August may boost sales
The white Destiny bundle and white PS4 sold in September will boost sales.
According to VGChartz PS4 is currently at 8.74 million consoles sold as of July 19th.
EDIT! Sony announced at gamescom that more than 10 million gamers now own a PS4. It is very likely that they exceeded 10 million last week(week before gamescom). Congratulation to everyone who guessed it.