I always wonder about this trope. Why would Laura Street be 'improved' by 'opening' it to the river? Does this help Liberty, Hogan, Pearl or any of the other streets that are already 'open'?
I think it's very important that they open it up to Laura Street. Like UNFurbanist said, it is pretty uninviting right now. I think Laura Street is a nice link between Hemming Plaza, the most historically significant block of buildings in Jacksonville, and the river although the river is cut off right now by the ugly structure of the Landing. The most important thing in my opinion is that it has more green space than currently. Downtown does not have much of any nice riverfront greenspace.
I like the idea of taking out the ramp to Main Street and having most of the building structure on that side of Laura Street including an 8 to 15 story residential tower recessed from the first 2 floors of storefront/restaurant/offices, and on the other side of Laura Street and towards the river have more open green space with maybe a much smaller building footprint (2 or 3 storefronts or restaurants) away from the river along the road. The idea that you create much more open space that pedestrians would want to go to close to the river. Maybe an amphitheater in one corner closest to the river.