I'm a regular poster on the Official World of Warcraft Forums. For upcoming MMORPGs, there is absolutely no way he will be able to play any of them, and World of Warcraft will be on the least requirement MMORPGs that will come out, and it's guessed that the requirement for WoW will be 32 MB.
In order to put all details on "High" and Resolution over 1600 x 1200 with abosulutely no lag on EverQuest 2 is a 3GHz processor and 256 MB Ram Video Card. I can find an article about it.