Even if 50 countries decide to ban Bitcoin it can still win. It would need almost the entire world to get rid of Bitcoin and even then Bitcoin isn't gone. How are you going to destroy it? The blockchain is out there on millions of computers. Another government could change their mind and boom you can just activate you wallet and there you go. You can't eradicate Bitcoin. You can only try to somehow make it difficult for people to use it, probably you can't even prevent them from getting it when there are decentralized exchanges involved.
Governments won't be able to "eradicate" Bitcoin. But they'll be able to restrict people's access to it. This is easy to achieve, considering that centralized exchanges dominate the crypto market. By preventing people from exchanging Fiat to BTC (and vice versa), governments will be able to put Bitcoin's mainstream adoption on the ground. Of course, the Blockchain will still be alive. But only a very small minority will use it, while the rest will carry on with Fiat. People will think twice before using Bitcoin as they could face fines or jail time. You'd have to move to a country that's friendly towards Bitcoin to prevent this. I wouldn't worry about a Bitcoin ban as long as there's a country that supports it. Just my thoughts
