Most Americans are too complacent in what is happening for there to be a civil war in the near future. A war would take away from basic comforts and entertainment, such as television and the Internet, which sways people away from even large-scale protest. If the citizens are unable to come together for a successful peaceful protest, then there is no way a civil war is on the horizon.
Although there seems to be a lot of unrest in the United States lately, it is nothing new. There are always small factions of people that cry out for a revolution over one belief or another. Although these groups are heard through the media, they represent a small percentage of Americans.
People study history to learn from the past. In that vein, the United States has taken strides to implement laws and policies since the Civil War to prevent another one from happening. Although a handful of people in a few states may call for succession, the likelihood of any state ever actually succeeding is very minimal, and the likelihood that the government would resist efforts to do so, particularly if the state in question is not one of the most populated, are even less.
In order for a new civil war to occur, several states would have to succeed from the U.S. It is practically impossible constitutionally for any state to succeed. Even if a state managed to succeed, they would lose the protection of the federal government and much needed funds to sustain the state economically.