But it wouldn't be a dramatic change.
When I joined we couldn't use capitols or I would be MiCk-MiCk.
Someone said that might be noobish but I assure you that is how my name has existed since the mid-80's. It has more meaning to me that way.
I have once. It wasn't easy though. I had to delete everything from one account and re-upload it into another account. Then I had to convince all my devwatchers to switch over and only about half of them did...the other half just stopped watching . But I'm very glad I changed.
However if givin the option now, I wouldn't do it.