Yes, but. Syria alone is not a factor. Syria is the third leg of the Iran-Hezbollah-Syria stool. You kick the Syrian leg from under it and the whole thing comes crashing down. Well worth it, imo.
The fact is...yes IRI may have few allies , if u can call it that...so Hezbollah and Syria may be quite important to IRI but vital as a life line..? doubt it..after all Syrians owe IRI some 20+ Billion dollars and Hezabollah is on the payroll....but what exactly have these 2 done to save IRI?..not a whole lot...
The other fact is...the more u try to get rid of IRI based on some Hollywood mentality and bunch of drug induced delusions...the more u have strengthen them..more u have given the excuse to be hard core and not democratic...the more u have essentially weaken the Iranian people...