Miners won't sell at 0 value if the cost is much higher. Anyway, market will verify if BTC-U has anything to do with real Bitcoin.
By the way, other are also trying to make money on naming their alt-coin Bitcoin.
https://steemit.com/bitcoin/@cardboard/bitcoin-segwit2x-update-war-incoming
Precisely. We aren't going to offer this upgrade unless there are multiple candidates already. If there are multiple candidates, why not have the best be one of them?