They have rebuilt the pathway, walls and so on. My guess is that it had to be painted to look right and appropriate for such an iconic statue's unveiling. If they'd have left the reworked concrete bare or allowed an ugly looking space to surround the statue I think we know what the wider world would have said.
Also, if it had been closer to the main entrance itself it would've been swamped by the necessary security checking and other stuff that goes on in that space, plus only certain fans would've been able to get to it on match day.