jmLÅABC only needs to replay protect its chain and Bitmain can happily go back to mining BTC secure in the knowledge that altcoins will spread like STDs and they can keep selling shovels. It's so easy.
https://whatsonchain.com/tx/f03ce178e98ce7a3b2f676c1fc5a6f846c839d835317ab361f7fec7f884851fe