The upside is that anyone traveling north on I95 would not have to go through Philthadelphia, which needs to bury a lot more than its highways.
Most people traveling North on I-95 don't go anywhere near Philly. If you're coming through Delaware North toward NYC, you take the Del Mem Br over to the New Jersey Turnpike (which becomes I-95) rather than take I-95 on its roundabout spur towards Philly.