Total size doesn't seem to actually be a problem, surprisingly. We have 1.9e8 domains right now; if we suppose each name is 20 bytes long, has a 20 byte nonce, a 20 byte revocation key, an 8-bit timestamp, and maps to an IPv6 address, we're looking at a per-node total database size of about 16GB --- big, but not unthinkable.
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