"For Blizzard, it makes sense to allow players to play for free WoTLK Gold at some moment," Chilton said. "But there's a lot of risk comes with the switch. It is common to hear of developers going free-to-play , and receiving more players However, you do not always know why things go in this manner and for how long this way. We're still not certain of the exact rate will be before people get bored and drop off."

World of Warcraft is the most popular subscription-based MMO game available on the market. It first launched in 2004. and had 7.7 million registered players as of June 30.

In the last week, Bethesda announced that its new fantasy MMO game The Elder Scrolls Online will be available for a subscription of $15 per month.

Elsewhere in the interview Chilton explained that his casual themed Mists of Pandaria expansion for World of Warcraft , released in September 2012. is "very success" for Blizzard entertainment. In fact, the game would have been less successful if the company had not launched the expansion, Chilton said.

He acknowledged that many players were concerned about the expansion being an departure away from World of Warcraft 's roots However, he said that it was essential to grow and develop the game.

"People with a love of Vanilla always comment that if it had been different, I'd be having the same enjoyment now as I had back then buy WOW WoTLK Classic Gold.' But this isn't the case. People's tastes change," Chilton said.