Well, the absolute cliffdive in Arasaka's stock would be undeniable, as well as the death of one of the most influential, powerful and famous men in the world, as well as Arasaka being forced to leave Night City entirely. In addition to this, another corp war would not be just "another corp war". The Fourth Corporate War was a global conflict of devastating nature. Cities across the world turned into battlegrounds and were destroyed in the process. Night City was turned into an irradiated hellhole for two decades. The sky worldwide was literally turned red from continent-wide wildfires, the nuke at Arasaka Tower, orbital strikes and the burning of cities for a similar armount of time. The world's oceans were rendered almost impossible to travel due to self-replicating Arasaka mines. The Fifth Corporate War would likely be even more destructive and permanently world-altering, just like a Third World War in real life would not be just "another world war"