I do fear, however, that as the internet becomes regulated more and more, the day may soon come when it will no longer be possible to initiate TCP/UDP connections to arbitrary ports on arbitrary IP addresses.
worst comes to worst, the bitcoin client can be modified to communicate over email. perhaps the bitcoin messages will be hidden steganographically inside jpg email attachments. Webs of trust will prevent government agents from knowing whether a pet photo that I sent to my aunt contains a hidden message or not.
then there are always wireless mesh networks for the last mile distribution.