You'd think it could be "updated" later down the line. Though im assuming steemit treats the name as a raw address, instead of having a numerical address that can be appended with a set name (much like burstcoin names for a wallet address)

Secondly, it would be easier to just make another account, but AFAIK it takes forever to do so now.

Edit: i know you can change display names on the blockchain, but it doesnt change the @ address