Maintaining a reasonable size for the root zone
Today's root zone is small enough to make it practical for caches to regularly and efficiently fetch compressed and digitally signed copies out of band (e.g., using HTTP, rsync, or BitTorrent), and caches that do so benefit from improved DNS resolution efficiency while also lessening load and dependence on central network infrastructure. I would like to suggest that whatever policies ICANN adopts regarding adding new records to the root zone should maintain this property. As a moderately concrete suggestion, I think the growth of the root zone file (in bytes) over time should try to stay within Moore's law. This seems as reasonable as any estimate about the capacity of caches to handle a complete local copy of the root zone.