Frank Gibeau was speaking at gamescom when he revealed his thoughts about the future of gaming and briefly referred to the new Sony and Microsoft consoles.
"I've seen both of them," he said. "Ten years ago, we used to measure our market in terms of 200 million people.
"Now we are at a billion people playing games, and we have a straightline view on two billion."
Rumours have been circulating regarding the successors to the PlayStation 3 and Xbox 360.
Hardware details have apparently been leaked recently about the PlayStation 4, with its codename said to be 'Orbis'.
A leaked document for the new Xbox has also supposedly been leaked, while the console is reported to be at the manufacturing stage in Texas.
Photo gallery - Xbox's ten-year history:
Copyright: Microsoft Games