We can simply use an encrypted internet connection to connect the node. Use something like dnscrypt for example, and you can connect again with other nodes. I'm not really sure the government wants to ban Bitcoin (blocking their connection) because it's just a waste of resource. They might try to shut down any cryptocurrency exchange though so that people won't be able to cash out. But we can still trade offline, or use something like Bisq.
I don't think government crackdown will happen, but if it does, I believe we can find a solution for that.
That's certainly true, mate. In the event of a global government crackdown, there's always the choice of alternative networks and decentralized exchanges. While this is very unlikely to happen, we cannot discard the possibility that it could happen someday if Bitcoin and other cryptocurrencies become a concern of national security (like criminals using it at a large scale to conduct illegal transactions, etc). If Bitcoin and other cryptos remain taxable property (like they are now), then they'll be supported by the government for a long time.

What Global crackdown?
Most governments already accepted Bitcoin either as a currency or a commodity

In any way, if governments decides to "ban" Crypto currencies, people will just go underground with it.
They cannot stop the Bitcoin network, because it is decentralized and nodes are spread all over the world.

Yes. But I believe that a global crackdown will occur if governments are deeply interested in forming a single world currency for the New World Order. Once that unified currency becomes active, then other alternatives (like Bitcoin, Fiat, etc) will be eliminated until the world is using the One Global Currency as the only medium of exchange. All countries will have a common currency, becoming much easier to track the world's transactions.
It sounds terrifying but if it becomes a reality, then cryptos and all fiat money as we know it will be dead in the future. There will only be "One Global Currency" for the world. Despite this, if a global crackdown never happens, then Bitcoin and other cryptos will continue to flourish in the mainstream world.