The Marco Polo repair costs will far exceed the cost of retrofitting with sprinklers. Marco Polo will retrofit because it will have no choice. All of its insurance will be wiped out.  Unless Marco Polo complies with all fire code regulations, it will be uninhabitable from an insurance point of view.  That said, when people learn the cause of the fire and why it spread so quickly, putting sprinklers in all buildings may be less of a concern.