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There are latency issues. Suppose you meet up once to exchange CDs full of random data 20 years ago.

Now you can exchange messages with newspaper adds secure in the knowledge nobody can ease drop even though your secure communication happened 30 years ago. Granted, this is limited to low bandwidth text, but you can leverage this for key exchange if you happen to trust some other form of crypto.

Of course, given that the CDs are kept securely or promptly destroyed upon use.

You can mitigate the metatdata leakage by posting your GPG-encrypted message on pastebin, over Tor. Address it by putting the title of the next message in the encrypted text. For bonus steno disguise the message as a GPG signing block for something boring.

Consider steganography.