I think for a tactical game like CMSF, such a debate isn't too relevant to this operational and strategic talk being put forward - the CMSF designer will always seek to put you in a position of parity, or at least an "interesting" situation where one side does not automatically have the right to a win.
On the operational and, more importantly, strategic level you are hemmed by the fact that no matter which way you shake it, the Syrians lose. So it's a lot of "IF value X is true, and IF value Y is not in play, THEN..." If my auntie had a robotic aircraft carrier then she could do a lot of damage to somebody.
However it's an interesting debate... I think that Karelian has it on the head - Hezbollah style tactics, on the ground that could work, is what the Syrians could best do for this sort of mobile, sticky defence. Anything else and you've got a lot of variables to play with - for example, concealment to get to your next position. All well and good, until somebody throws up a few UAVs and starts, say, laying fire onto your expected exit routes.
The Syrians could cause trouble, but then it's more of a political matter as to whether they'd win - Hezbollah, and say the VC, are good examples of mobile defence, but then you could say that the real reason they didn't lose was political... obviously all stuff outside of the scope of CMSF.
My .02 cents on mobile defence, Syria and the arab armies... more 0.11 cents, really.