These groups have formed armies that hide in the jungles and escape capture by the nation's legitimate army. They are responsible for kidnapping foreigners and demanding outrageous sums for ransom and for most of the violence the country experiences. Since these groups asked for peace, they are unable or unwilling to continue their violent revolt. They are likely to help maintain peace if the government treats them fairly and does not resort to totalitarian practices that are responsible for their formation and insurrection. Hopefully, both sides will resort to more peaceful and democratic methods for handling disagreements and disputes. If not, the violence is likely to reoccur.
Yes, the Colombian peace accord signed by the government and the rebel group will serve as a strong reminder of the people's desire for peaceful resolutions. Even if a conflict pops up now and again, the accord, like the U.S. Constitution, will serve as a document for getting both sides back on track.
While the peace accord signed between the government and the rebel group is a fantastic step forward, in order to put a lasting end to war both sides will have to stick by it. The Colombian government also has to look at other changes in the military and police to make sure they aren't acting against the accord.
In long-lasting conflicts such as the one in Columbia, it typically takes more than one peace accord to actually cement the peace process. Tensions are so high at the end of the fighting that many people are not yet ready to lay down arms. The real test of the accord will be in a few years when tensions are high again and a new deal needs to be worked out. At that point, do the sides come to the negotiating table or back to the battlefield?