Not really.
Compare a toucan's flight to a sparrow's. That beak, is quite an expensive investment (even so, it would be a good deal more expensive if it was replaced with a mouth-full of teeth of the same size - flight would be a good deal harder).
Without knowing much about toucans, I would guess that sexual selection had something to do with it. Much less likely is that the beak is necessary for some particular type of food harvesting.