In a country that has been run as a corrupt dictatorship an in a constant state of emergency for 30 years:
- the army state that their role is to protect the people
- the people trust the army more than they did the police or the politicians
- the army protect the people against the secret police
- the dictator leaves and the army takes charge, and the protesters celebrate.
As George Alagiah pointed out, this is the first time that the Egyptian people have had charge of their own destiny for 8000 years.
The region is going to be massively unstable for a while yet, but all the signs are good.