Max Boot describes the situation in Syria:

In other words, a deadly sectarian civil war is under way in Syria, and one that, like previous civil wars in Lebanon and Iraq, is drawing in its neighbors. We could be in for years of hellish, destabilizing violence.

Naturally, his proposed remedy is to ensure that there will be years of hellish, destabilizing violence by doing everything possible to build up the weaker side in the civil war:

There is only way to restore some semblance of peace, and that is to topple the Assad regime as expeditiously as possible. But that won’t happen until the U.S. gets off the sidelines and, in cooperation with our allies, extends more aid to the badly outgunned rebels.

Put another way, he would like the U.S. and other states to do for the Syrian opposition what Syrians did for the Sunni insurgency in Iraq*. The goal cannot be to “restore some semblance of peace,” since the proxy war that would result would represent an intensification and prolongation of the conflict by design. It is unlikely that arming the opposition would result in regime change, but we can expect that it would inflict even more hellish, destabilizing violence on the population of Syria in the attempt. A “victory” in this scenario would be something like what happened during the war in Nicaragua in the 1980s, which required years of hellish, destabilizing violence. There is a deadly sectarian war in Syria, and Boot’s answer is to make it even worse than it already is.

* It doesn’t seem to concern Boot that some of the very same people who were aiding the Sunni insurgency in Iraq against Americans would likely be receiving support from the U.S.