I would rather see Comcast improve their DNS server availability first, or at least in addition. For the last three months, I've turned to using another DNS provider because Comcast sees fit to run nightly maintenance on their servers sometime after 01:30 CST. Rarely has connection to the internet been compromised, rather to the DNS servers themselves. If they're using load-balancing hardware, I'm not seeing it as an end-user. Hopefully they can piggy-back a reliable high-availability architecture in addition to DNSSEC...