If you're worried about communication, there are people that can't even speak english and play MMO's.
My point is that making keyboard mandatory won't make the game "noob free", and allowing players not to use it won't increase the amount of uncommunicable players that much to justify that "PC and console games CAN'T BE TOGETHER!!!" attitude,
in my opinion.
Anybody who's worth playing with will buy a keyboard, and anybody who thinks a keyboard isn't mandatory for a MMORPG will give you more hundreds of reasons not to play with them, so forcing them to have one won't make any difference.