Correct, that is impossible. The worst Turbulence can do is give you a bit of a bump around. The wings on these airplanes are built to withhold massive pressure and bend, so the possibility of the wing breaking during turbulence is out of the question.

And airplane can crash in a severe downdraft, which may feel like Turbulence at first, but infact is a rapid downburst of wind, usually on the tail of a severe thunderstorm and usually on final approach. CAT, the most common kind of Turbulence can cause no harm.

If you are flying a smaller airplane, like the ones I fly, then PERHAPS there is a greater possibility of some structure damage.