I'm sure there are A LOT of people just needing that one last summer pet for the achieve. IMO it's always worth having the epic pet quest up, if you are still running around doing faction quests, killing the overland raid guys, etc. I compete it every few days, enough so that I've gotten all the pandas. But yeah, that and the other upcoming pet changes will be pretty nice. The real pisser is going to be the pets that will come from pet pvp achieves.
Also, I maintain that for an account only 7 months old, I ain't doing too shabby =)