Gossip is P2P. The protocols can be hidden as if they were SSL or some other widely used protocols, but without the PKI and the centralization problems that has. Evading the censors will probably be a continuous effort. The great firewall has not succeeded in preventing the use of proxying services and VPNs, despite the efforts.
If internet censorship becomes too widespread, people will use other communication mechanism to conduct trade. As I mentioned, Bitcoin is broadcast over satellite and radio in some locations. You can send a transaction as an SMS message. A bitcoin transaction is ~250 bytes and can be encoded as a sequence of 16 emojis. I can print a bitcoin transaction on paper and the recipient can scan it.
Sure, but "evading the censors will probably be a continuous effort" and "censorship becomes a non-issue" are not compatible in the real world.
Even despite that the great firewall has not succeeded in preventing the use of proxying services it still is a massive success. And despite all the ways you can circumvent it censorship very much continues to be an issue, I'd argue more so for every day.
The instant such SMS message transactions become popular a quick filter will kill that if the need for it arises. And SMS is hardly the technique for privacy minded communication (neither is bitcoin).
What remains is perhaps ham radio. Still easy to triangulate, jam and is not accessible to anyone but the most extreme. Making triangulation even more desirable and paints an even greater target on your back.
Printed copies are hardly something to look forward too, it also excludes pretty much everyone. Cash would be quite superior unless you are transferring huge amounts (which most won't).
If internet censorship becomes too widespread, people will use other communication mechanism to conduct trade. As I mentioned, Bitcoin is broadcast over satellite and radio in some locations. You can send a transaction as an SMS message. A bitcoin transaction is ~250 bytes and can be encoded as a sequence of 16 emojis. I can print a bitcoin transaction on paper and the recipient can scan it.