I do not believe that the Dwarves intention was to kill Smaug, I think Thorin, led this adventure because of his desire to regain the Arkenstone. I don't think Gandalf actually had a plan for getting rid of Smaug, but I do think that Gandalf was far sighted enough to realise that if the dwarves and Bilbo, succeeded in getting into the mountian, then other events would take over and Smaug would be destroyed. I also think the Gandalf picked a hobbit to go with the dwarves, because Smaug did not know the smell. So Bilbo would be able to wander into Smaug's lair when he was out, and smaug would not have known what had been there.
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