Man, this is a tightrope. Lots of bad directions possible:
-standing still or even backtracking on basic freedoms if Mubarak stays in power.
-same to be said if the VP steps up. More of the same.
-ditto with the military...plus the added problem of, "Who's THE person in charge?"
-Another possibility: the anarchy and chaos route...that usually yields to another tyrant; or more likely in Islamic circles, an ultra-fundamentalist regime.
-An Ayatollah or Taliban-like leadership.
Unclear succession and leadership vacuums are bad. In an Islamic country, they're really bad.
Just praying that Egypt does set that part of the world on fire.