Since Murarak's son has already fled Egypt, that plan is already useless. The turning point in the whole thing is obviously the military. They could support Mubarak, support the popular revolution, or take power themselves.
I would not discount the last option. If the military does take control of the nation, that does not automatically mean a military dictatorship. They could form a transitional military government and schedule elections. Whether they would allow the Muslim Brotherhood to participate is another question. The military has been fighting Hamas, MB's armed wing, for decades in Egypt. There is no love lost between the Egyptian military and MB/Hamas.
* I have the right to live, thus I have the right to defend my life from attackers who would take it from me.
* I have the right to my private property, thus I have the right to defend my property from thieves who would take it from me.
* I have the right to self-determination, thus I have the right to defend my liberty from tyrants who would take it from me.
* The only usable tools for these tasks are guns, and thus I have the right to shoot anyone who would take my guns from me.