Considering that hezbollah has been syrian and iranian for quite some time simply operating in lebanon and recruiting there, it's no surprise to see them lining up with assad and Iran.

This war is just beginning. If Assad is only NOW beginning to pull out the scud missles and bringing in hezbollah then there is at least another year to this conflict if not more. And the money behind the fsa is from qatar, saudi, and other arab gulf states that want to defeat Iran but don't want all out war across the gulf.