When there is no chance to reach consensus it's better both parties go their own way. Splitting a new BU Coin is the best solution in this case.
This has been suggested multiple times, but BU supporters insist that their wacky implementation must force Bitcoin's hashrate onto their coin. BU wouldn't stand up in the marketplace as a separate coin, no investor is going to risk real money on something that is designed to be super-easy to fork.