Why not just knock it down and put up a McDonald's?

Among other reasons, it's there because it's historical. A testament to a lost time. I would argue we should maintain it's current state, but I'm hesitant to say we should rebuild. Everything done to these monuments throughout history stands as a reminder of the time, and will continue to stand as a reminder of time after should it continue to change.

We don't need the space for anything. If ever there comes a time when we do then taking it down or even rebuilding will just add to the site's rich history.