Manpower shortages plague the Syrian military:
Cracks, meanwhile, are also showing on the regime side, which is attempting to boost its ranks with conscripts and reservists. Some 1,300 men were forcibly conscripted to the army in Hama alone in a wave of arrests and raids in October, according to activists there. The regime is said to be increasingly reliant on irregular force. “It all comes together to paint a picture of regime manpower shortages,” says Theodore Bell of the Institute for the Study of War.
I've been writing that Assad's casualties could be what breaks his regime. The cracks are more visible lately.