I am not afraid of IP4, the resource is already scarce and their cost provides a good measure against attackers that are not The Man.
They have almost zero cost. Any retard can botnet hundred thousand of computers IP and proxy them ports all back to farm of pi's / emulators. Any govt can use all its thousands of worldwide residents embassy and military staffs to get worldwide IP's pools without even any sneaky attacks like abusing secret FVEY++ peers to give them IP proxy of unused addresses from networks too. But no, USPS cannot give user ability to overlay network exit for help ensure their privacy, because only IPv4 is "safe" for USPS. Bitcoin have many many privacy overlay users, even full mining nodes on overlay for their privacy, do you see it be not "safe" for Bitcoin network, any real incident of that, from even day one to now.
I am not scares about Govs too, since they haven't moved a finger yet against bitcoin, even though they can.
And if they do this network blocking of BTC and USPS, which will going to still be transact... only those on the overlays... which means BTC win USPS die, because USPS not allow user to use privacy overlay.
The public protocol do not need to be encrypted neither in Bitcoin not in USPS. USPS is running encrypted today though. The fact that Tx or consensus protocol goes in clear doesn't affect the pseudaanonymity nor the privacy.
??? Move to Thailand / China / wherever / everywhere that spies your network wire, builds nice big databases of everything you do on it, use Bitcoin to pay a cleartext tx from your photo ID IPv4 node physical address and Bitcoin address, to cleartext to some online market known Bitcoin address for some weed, or tx/rx a hello Tiananmen 1989 65 in blockchain message data field. Your ass is going to jail, be in database, for long time. In general, all coins should be encrypted and network overlay-able.