Good question. Depends on the place and the amount of damage. Ironically, the bridge was created as a de-facto barrier that prevents any sizeable vessel to go anywhere beyond one narrow passage - which is easier to control. Or to shut down, as they did in 2018 when they prevented Ukrainian gunboats and the tug to enter the Azov Sea. They towed a disabled tanker from Kerch Shipyard and place it under that main span. So, if that span collapses now, most of the traffic will stop, indeed.If Ukraine drops the Kerch bridge, how will that affect shipping through the straight?
In other words, if they partially collapse the main span instead of obliterating it, that may create a shipping hazard.