On the one hand, it could be annoying to have to memorize new usernames. That could be dealt with through some sort of penalty system for name changes; the "lose all your XP" is a bit harsh, I think, but I could see "lose one rank" - e.g., a Friar who changed their name would be dropped to the lowest XP of a Monk. And I could also see a restriction on how often you could change your name; perhaps every couple of months, as mt2k has suggested.

On the other hand, I don't see most of the people who have "established identities" changing their usernames much. I doubt I would ever change my username; I use it for many things, it isn't just my PM username. There are RL people who don't know me as anything but Ozymandias, or Ozy. Running through the mental list of people I know here, people whose usernames I recognize instantly as a particular person, I can only think of a few who might.

And even if I don't want to change my name, that doesn't mean others shouldn't be able to change their names, if they wish.

So, I guess, I don't oppose the idea of changable usernames; I don't know as I support it, either.

- Ozymandias