Exactly - one step at a time. In recent history, it seemed like the Bay Bridge would be replaced first which would allow taller ships but would require a new terminal in Baltimore prior to reaching the Key Bridge. But now it looks like the reverse might occur with the rebuilding of the Key Bridge. However, the old Key Bridge was very steep at its 185' above the water so the onramps would have to be re-engineered to allow a lower grade if the height were to be increased (e.g., the NYC Verrazano Bridge is 225' - a full 40' higher than the Key or Bay Bridge.