This is the age of Aquarius. The knowledge bringer. NOTHING can stop the truth.

If T.H.E.Y. lock down the internet, then a way around it will be made.
There are several possibilities in the aether that will allow planet wide communication.
These will be ours in the near future.

There always exists a black market.
There is an world wide network that doesn't use the internet. (yes, the radio wave guys, who will have more adherents if it becomes the means to exchange bitcoin)
If the black market decides bitcoin (or more precisely bitcoin lightning network) is the money of transactions, then it will be.

And, can you imagine how upset the masses will be if they can go online? That is something most people will riot over. So, i doubt that they will be able to lockdown the internet. Can't even do it in China