An issue was the amount of DNS queries. It turns out that these can easily be several millions. Depending on the load on a nameserver reading this information may take in the order of magnitude of an hour. During this time most routes are still unauthenticated which is also the case if DNS was down. However, this is the situation today.
Additional authentication improves the overall situation.
Concerns regarding router performance are considered to be unimportant because the CPU power needed is negligible. It just eats through the entries in its idle time. Therefore, input to the proposal is welcome. The proposal is available at PSG and as Internet draft . There was no input from other working groups at this time.