Well, the idea is that most people will run out of basic supplies 2 weeks into the blackout, which will force everyone to turn to violence to survive. I agree that 2 days is not a big deal.

In a dying society like that however, it will be almost impossible to allocate labor to fix issues that caused the blackout, because as time goes on, violence on the streets increases. Weeks on end without food, water, heat, sanitation, order on the streets, weeks without ability to call or text anyone, people's trust into the government disappears, as does the trust into the currency of the country.

In a scenario like that, society eventually hits the point of no return.