Ex EGLL, none that know their job is the answer. The purpose of evacuating is to avoid the risk of more serious consequences by staying onboard, not to worry about being second-guessed later. No breach of the fuselage is simply not an appropriate criterion to judge an evacuation on.
A fire of a tenth of that magnitude is more than ample reason to evacuate in most pilots' view I think. We all know how fast a fire can turn into an inferno - unless the fire surrounds the aircraft the only safe place to be is outside and fast.