There is literally not even a chance that an attack like that will evaporate even a quarter of the water dome. Kakashi was able to nearly stalemate it with a significantly smaller scale suuton.
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Earth>Water is insignificant when the suuton technique absorbs any jutsu with chakra in it. Iron Skin is infusing his
chakra with his skin, therefore it will be ineffective against Great Shark Bomb.
I thought you just meant in general that his wind+fire technique will absorb any water technique kisame throws at him. You're counter to water dome is very far fetch'd and unlikely, even if it were to work, whats stopping Kisame from creating another one? He is able to create a lake with less then 30% of his chakra.