F2P is good, but had disadvantages. One of the mains being that, since the game will be Free, hacks and bots will be used a lot more because people won't have to worry about losing money on their account being banned. But still, F2P is better because it's free, and more people will play it. If they like it enough, they'll possibly look at item mall items, maybe like the IM items, and then pay for those, which may get the company more money, which will make the game more important, which will result in the company helping more and adding more stuff. Even though I listed only one dis-advantage, there are probably a couple others, but the F2P part has more advantages.

Also, not many games are going F2P, and WoW will never go F2P. they are making such an immense profit that if they stopped, they would have to close many servers, open an item mall and sell Rares which will unbalance the game. Other games may go F2P, but not WoW.