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A number of untruths about weaponry in Syria have been designed to discourage support for the Syrian rebels. One of the more transparently baseless was that whatever weaponry was provided by the West or their puppets/puppet-masters in the Persian Gulf, the Russians would simply provide more to Assad in retaliation, without making it clear how bombing the shit out of more civilian neighbourhoods would help him win the war or be acceptable blackmail to give in to. And as it turned out the Russians have continued to fight the Syrian war on the cheap, letting the Iranians and Hezbollah make themselves unpopular by doing the actual murdering in Syria. And there were every possible variety of Don't You Know You'd Only Be Creating A Level Killing Field? by those casting this as a civil war with roughly equal support to both sides, rather than a revolution where only those committed to the régime don't want it gone, with only its massive firepower advantage keeping it on life support. But rather than Assad being an eternal feature, as the war drags on, more people in the government held areas will wonder if the only way for it to end is for Assad to go, which will cause the torturers and murder gangs that are the government forces to crack down on any indication of dissent what soever, creating an intolerable situation with revolution the only tolerable answer. If Assad does persist, there is going to be exactly the opposite result to that the realists suggest, not a calming of the situation, but an increase in all the indicators of instability. It will be hard to see how the régime will be able to present itself as at all legitimate when it gets to force more than half the population out of the country entirely, but may stagger on if it can't be knocked over. Again in contrast to the realists, the evidence of the last three years is that it is the lack of support to those most interested in a striaghtforward revolution that has encouraged the growth of extreme Islamism. If Assad pesists, the entire country isn't going to turn into an al-Qaida support group, but it will be far more messed up than it ever had the need to be. 
There is quite an accurate assessment of the size of the rebel forces, but much less understanding of the relationship between them, by another pro-Israeli analyst here*, whose analysis falls short because he looks at all the groups through the focus of their expressed attitude towards Israel, rather than the struggle in Syria they are actually engaged in. The piece is worth reading though, and I might get back to it at some point.
"As an extremist group which owes its existence to the West’s reluctance to act in Syria, Jabhat al-Nusra’s behavior in Deraa is a clear sign of desperation. The aging US-made TOW anti-tank missiles which recently appeared in the hands of approximately 12 FSA units have already boosted American credibility in both northern and southern Syria.
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The Assad regime and jihadist rebels are undoubtedly pinning their hopes on the West’s track record of abandoning Syria’s moderates at the most inopportune times
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In its efforts to discredit Western involvement, Nusra will likely spare no effort to get its hands on some of these systems. As this media-savvy group is surely aware, videos of their fighters with these weapons appearing on American television screens will deter the Obama administration from transferring even more potent arms into the coffers of Syria’s rapidly-rebounding moderates. With President Obama weighing a request by Syrian National Coalition leader Ahmed Jarba to provide anti-aircraft missiles to selected rebel units, Nusra’s window of opportunity is closing."
*[http://www.israelnationalnews.com/News/News.aspx/180622…]