one large gaming platform like this accepts Bitcoin, the rest will follow. This game are ideally suited for Bitcoin, because they sell in-game resources as bundled packages to progress through the game
The small payments required for these online games can eat up a lot credit card/SMS fees. I guess not enought demand from users, but Plarium loosing the most as they must really pay high percentage of incomming credit card and SMS income in form of fees. Less profit for them, but I dont think they would get many Bitcoin payments unless they give their users additional incentive to pay with Bitcoin - but even with discounts when paying with Bitcoin, it would still be win situation for both, users and Plarium.