The article posted actually talks about EasyDNS's implementation of exactly this. > At easyDNS we experienced so much pain from this reality that we created a

The article posted actually talks about EasyDNS's implementation of exactly this. > At easyDNS we experienced so much pain from this reality that we created a system to automate flipping DNS providers at the first sign of trouble. > We call it Proactive Nameservers, and we’re the only company in the world doing it for some reason. Maybe this is because in order to provide a service like nameserver failover, it means a company has to admit to its customers the reality that their own nameservers may at some point, fail.