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No, I'm pretty sure EdFord2000 is talking about authoritative DNS where he can switch DNS for www.example.com from a static IP on his Verizon link to a static IP on his Comcast link when one or the other goes down. But you would be correct for recurs...
The ASA can do ISP failover and it can DNS for internal clients, but it is not an authoritative DNS server, so it cannot redirect www.example.com from using a static IP on one of the ISPs link to using a static IP on the other ISP link if one goes do...
I know this is an old post, but I had the same issue with a similar ASA5505 in a small office that was hitting the 10,000 connection limit. The security plus license upgrade brings it to 25,000 connections and solved the issue. The part number is L-A...
