There was a plan to move it either out of the plaza entirely into its own park or down closer to the water/out of the flow of traffic, and a local group sued to stop it. They argued many things, the most interesting of which was that the artist's original intent placed it exactly where it is now due to how the sun sets across the river. There are actually laws out there that prevent the removal of statues if such removal would ruin the artist's original intent for the statue. The local group obviously won the argument...and I know because I was one of the attorneys who did the research and wrote the briefs for this very case.