What if the world doesn't actually need Bitcoin? What if people stop buying in the rhetoric?
What rhetoric? Your question is without substance, unless you clarify what you're talking about.
Those anti-government/banks "Bitcoin miners" might face some battle tanks. 
Another poorly thought out sentiment, which government do you think will be targeting Bitcoin Miners with battle tanks? Bitcoin is all over the world, do you think all of the governments of the world will unite against Bitcoin? Do you think it is likely that a single government will attack the citizens of every country worldwide for Bitcoin mining? I doubt both of these, so what are you implying?