Also, why on Earth would a BitDNS want a blockchain that updates every 10 minutes? Why not an hour instead? Or every minute? Why be chained to the cycles set for another purpose? It’s less than ideal from the beginning.
Then be sure to add the ability to specify multiple authoritative servers for one domain. This is possible for DNS as I know (MS Windows AD does it)
So those who do not want what their site to be able to shutdown can make a lot of spare servers and when they turned off by Big Brother name owner just change the settings by removing old servers and adding new ones.