The ccTLD then on its side finds out that the problem was because of a mistake in the root-zone and doesn't want to bear the liability cost on something that was not his fault. The ccTLDs then sue the root. The root is crucial to the Internet Community as without them the system will break down and the customers domains will go down. There fore the TLDs need to have insurance about the stability and an agreement on the service level. The service level agreement to a domain name holder can t be stronger than its weakest link.
Today there is no insurance from the root-servers about the service today.
The root server manager must disclosed the true, unbundled costs of operating the service to the ccTLD mangers, or to a designated ccTLD constituency representative.