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I’m not asking this question for a very short term.
There is a trend, that those once successful B2P or subscribe to play games, after they have run a couple of years, they eventually turn to F2B games. The reason is obvious, the games have become too old to attract new players, and the old players keep leaving due to the lack of new content. However those don’t kill a game directly, there is still value to exploit. By making a B2P game F2P, the company can keep old players and interest new comers. That has been practiced by a lot of games.
It has been nearly 8 years since World of Warcraft firstly released. Although impressive enough, it still has one of the biggest player base among all the MMOs, yet it is losing them fast. As Blizzard is siphoning its development team to the Titan Project, it is very likely that Mists of Pandaria is the last expansion that World of Warcraft ever has. When there is no more expansion to be added to the game, there will be no new purchases or the point to subscribe any longer.
Anyway this conversion is not going to happen any time soon, since there is no Cash Shop features can be applied at the moment, apart from the pet/mount shop. In a long term future, say about three or four years, what is it gonna be? What do you think or hope?