I think another big problem we'll have... Search engines...

Let's say someone google's your full name. The worldofwarcraft.com is such a "powerful" website that I bet real names will start showing up in results - probably first.

e.g. You meet someone, and they later google your name to check you out. First results come up on the wow.com forums about how Shamans need to get buffed, and how BS it is that Pallys are OP. Nice first impression, even if it's not really you.