In a new patch World of Warcraft is going to add an option for people that suffer from being colorblind.
There aren't a lot of games that take the extra effort to make it possible to make it easy to play for people who are colorblind. In the new patch Blizzard will add it to the game to make it easier to play for people who do suffer from colorblindness.
World of Warcraft is still the biggest MMO in the world with approximately 7.5 million subscribers. They recently released a new expansion called World of Warcraft: Warlords of Draenor.