How can someone even try to claim that Japan isn't becoming less relevant for Sony? Look at it this way,
There's 1 PS4 sold for every 23.5 people in Japan.
There's 1 PS4 sold for every 18 people in France.
There's 1 PS4 sold for every 17.6 people in Germany.
There's 1 PS4 sold for every 16.2 people in the U.S.
There's 1 PS4 sold for every 15.3 people in the UK.
Look at the UK and France. Combined they have a population that's less than 4.5% higher than Japans, and yet Sony has sold 48% more consoles in those two countries.
On top of that, most European countries consume the same types of games. so If you make a game that caters to that market, you have a huge pool of consumers to draw from even if that game has limited appeal outside of the region.
Bet with Adamblaziken:
I bet that on launch the Nintendo Switch will have no built in in-game voice chat. He bets that it will. The winner gets six months of avatar control over the other user.