Ned won't get away with it.
Sun will sue him to unwind the transaction when he realises this is his only way out.
Sun neither has the votes nor the technical capability to execute a hard fork and if he doesn't back down soon may face a legal injunction to stop him voting the ninja-mined stake. He has no idea about Steem or its community and has been stunned by the community fight back
His best option is to unwind.