Between this and Afghanistan I wonder how many other stable countries whose government seems secure but are actually susceptible to a blitz like this? More fun to think about, what first world country would be most likely to fall to something like this? Two common thread is majority support for the rebel faction outside of the main city, and the military buckling. A lot of the regime's troops either sympathize with the rebels, apathetic enough to not fight, or pragmatic enough to know they wouldn't win and the rebels aren't interested in killing the low rank grunts.
People think January 6th was close but that was never going to change Biden taking power; the process they interrupted was a formality. If those people truly were a threat security would've been ordered to start killing more and they already killed one.
The West lost Afghanistan which revealed it was a puppet government all along and the East lost Syria. I wouldn't be surprised if when the rebels fully take control the country becomes isolationist as it creates a new government. Maybe the new rebel-controlled Syria eventually starts helping Iran, Russia, and Hezbollah again but Hezbollah could be wiped out by then, Russia has to lick its wounds after they eventually win in Ukraine, the West could get involved and prevent it from forming again, or the rebels could simply decide not to.