I can't agree enough about the missed opportunity to use SRV records. This would have been such a monumental step forward.

Edit: It makes me a bit giddy (which makes sense if you factor in my being a sysadmin) to think about what SRV records would've done for load-balancing, running servers on non-standard ports, IP address exhaustion, and server migrations. Anybody who doesn't appreciate proper service-location hasn't ever done serious sysadmin work and, IMO, has no business designing protocols.