Blizzard has revealed some of their plans for World of Warcraft in 2015, and one of the most interesting tidbits is the possibility to exchange in-game gold for game time. The system suggested by Blizzard would allow players to buy tradable game-time tokens with in-game gold, giving players a option to extend their game-time without using real money.
Players could also sell their own time to other players, making some gold in the process. This is nothing new to the MMO scene (Wildstar makes use of a similar system as do other games), but this is the first time Blizzard has mentioned they are considering a similar system for World of Warcraft.