I'm not sure that removing usernames is necessarily a good idea; they have a valid and important benefit.
Let us assume that a person says X. I suspect that X is most likely incorrect. I then look at that person's username. If:
a) The username is one that I recognise, and belongs to a person who I have found is right far more often than wrong; then I take a closer look at X, and ask the person to explain, and generally put some effort into investigating X. It is likely that X is not as wrong as I thought, and I would learn something. b) The username is one that I recognise, and belongs to a person who often posts things that are incorrect. I don't bother to waste time trying to research X, since I am now even more confident that X is wrong. c) The username is not one that I recognise, or it is one that I recognise but have not formed an opinion on yet. I may spend a small amount of effort thinking about X; but I am likely to nudge the username a little closer to category b.
In this way, I can optimise the amount of effort I put into trying to see which statements are correct, by putting the most effort into statements from which I am most likely to learn something new.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.