If you ever have problems making accounts because of names being taken, you probably need a more original name.
Also keep in mind inactive users from before BL_ID forum registration/users planning on getting activation at a later date. If they decide to come back and their account is deleted, that'd probably be a bad situation. This really isn't a good solution to you not being able to use the name "coolbro" on an online lego video game forum.
Maybe it'd be a sensible solution to some other problems, but not this one.