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Summoner is not dead AT ALL in Abyssea. There are so many events where they shine very bright when it comes to fighting endgame mobs, the type where you need at least 4-8 summoners to kite the mob while melees got wiped and your healers are busy raising people. It's still one of the best job out there given the right atmas.
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Regarding SMN triggering weaknesses Malamasala brought up a good point in another thread that smn can use spirits to hit yellow !! though of course spirits are about as reliable at casting useful spells as dingos are reliable at babysitting.