Ya... I think we should all agree to stick with our known handles unless there is a legit reason to switch (like Randy changing from the email addy) and if we do maybe toss a tag in our sigs letting folks know who we are/were.
It's kind of like living in a neighborhood for years then a bunch of people you know get radical cosmetic surgery so you don't recognize them anymore.
Of course this is also rife with the possibility of shenanigans. Seems like a very bad idea. It's good people can change their handles if need be but I think it should be upon request so it doesn't get abused by sock puppeteers and trollioliolios.
/stick in the mud