The issue isn't the truck traffic across the bridge, it is the fact that almost all the port itself can't be accessed by the ships until the wreckage is cleared. So the goods won't be coming in or out of Baltimore at all. Cars are the big thing; everything else can be re-routed to ports north or south of there. Jacksonville and Brunswick are the other two big RoRo destinations (although other ports can handle some.) Shipping cars to the southern ports from Europe and then back north by train is going to add a lot of costs to those imports. And I'm not sure how well those two can scale.
“The issue isn’t the truck traffic across the bridge, it is the fact that almost all the port itself can’t be accessed by the ships until the wreckage is cleared”
That issue will be taking care of by sometime this summer I imagine. Present and soon-to-be shipments at the port will be diverted to other east coast ports. Expensive temporary adjustments for a few months but it is not like the goods will not be moved at all.
The longer issue is the bridge traffic but adjustments for that will be made.