The absence of a UN resolution and the presence of 'great power' politics means that the situation in Homs resembles a Benghazi without NATO intervention. A superb report from the BBC World Service this morning talked of rival resistance leaders, who could not stand one another, see the further reporting from Paul Wood here. It also suggested that the army was showing no signs of disintegrating and still held the monopoly on violence. In Egypt, the army stood to one side, remember.
A further important distinction to be made is the absence of heavy weaponry among the resistance. The army have armour and heavy weapons and hence can control large urban areas more easily. They have cut off likely supply routes so that illicit channels cannot be used to arm the resistance. Which makes Homs the vanguard of the Arab Spring in that it represents a suppressed population resisting by itself a minority ruling entity. And Syria is set to become a net importer of oil within a decade if current trends continue meaning its role as an energy supplier to the West is negligible, meaning it's strategic interest to the West is negligible: