Is there a good reason to not have a streaming update protocol for DNS? Surely it wouldn't be that difficult to prefetch the top N million DNS queries, then sub

Is there a good reason to not have a streaming update protocol for DNS? Surely it wouldn't be that difficult to prefetch the top N million DNS queries, then subscribe to a stream to keep them updated as TTLs expire? This would give you both privacy and speed (for the majority of queries) IPv4 address = 4 bytes Avg domain length = ~14 characters (http://datagenetics.com/blog/march22012/ http://datagenetics.com/blog/march22012/) So ~20MB per million domain names (assuming 1 IPv4 address per domain name)