Think about it for a moment. Would people who now hold XRP for instance buy Bitcoin if Ripple decided to file for bankruptcy? Would Bitcoiners suddenly buy ETH, BCH or XRP if Bitcoin became banned all over the world? I very much doubt that.
You can't ban Bitcoin without banning everything else. But if Bitcoin is ever going to be banned alone, I would for sure switch up to another decentralized crypto. I'm supporting decentralization as a whole.