That's BitcoinXT's protocol, sure, but that isn't Bitcoin Core's "protocol", so the powers that be can simply say "We do not accept your attempt to reject our reality and substitute your own."
But who calls it the protocol? Let's pretend this fork happens. Someone goes to bitcoin.org and download the software called bitcoin and runs it, and they won't be using that protocol.
Yes but as the article said some(s) started DDOSing or otherwise applying pressure to those who chose XT. That's on top of the fear of a long running fork in the blockchain.