Somehow, i don't think they are going to be up for tying that to their real identity.
There are two possibilities. This either massively improves the discourse on games like COD and the equivalent of every xbox live game ever. Or, people don't use it, because they don't want that. I"m going to go with the second.
Put another way: can you imagine the average gamer in COD wanting to tie their character "XXXAyeCarambeHarambeXXX420 to their real identity?