Could you please expand? If the big Chinese miners go rogue (actually go rogue, take over a currency and actively tries to stop the larger public from taking it

Could you please expand? If the big Chinese miners go rogue (actually go rogue, take over a currency and actively tries to stop the larger public from taking it back), what recourse does the larger public have? Wouldn't they need more mining power, or an impractical fenced-off network that's still decentralized in some manner?