Could nonviolent resistance have succeeded in Libya? Here are four points worth considering:
1) The movement was fairly spontaneous, unlike the highly coordinated campaign in Egypt. As Peter Ackerman consistently points out, planning is an essential element to a successful nonviolent revolution. As with any battlefield, a nonviolent campaign requires extensive preparation. But reports seem to indicate that Libyans began protesting in earnest around Feburary 15th, likely inspired by events in neighboring Egypt and Tunisia. Gadhafi seemed prepared for this and immediately cracked down using overwhelming violence. By February 19th, the movement had become violent in response to these crackdowns. Four days of civil resistance doesn't give it much time to work. Egyptian pro-democracy activists struggled for years before seeing Mubarak fall. Syrian oppositionists, thousands of whom have been killed by Bashar al-Assad's regime, have toiled along for the past six months. So, we can't really say whether or not nonviolence would have worked in Libya. It never had a chance to materialize in the first place.