The rebels have now emerged as a "quasi-professional army." He said their advances have made make it "much easier to impose a no-fly zone in the north of Syria" -- if that happens.
Yet, the Syrian military hopes to gain advantage with its superior firepower by locking down key urban centers, such as Damascus and Homs.
But Weiss notes that the government hasn't had a major military victory in the north of Syria for months, and the rebels have effectively encircled Damascus.
It also hasn't embarked on major ground offensives, like the one in Aleppo earlier this year. Such activity puts the army at risk of more defections and desertions.
As analysts study every move by the rebels and government forces to determine Syria's endgame, the people living there -- some filled with hope, others mired in frustration -- want to know when it will end.
Echoing a common sentiment among many Syrians, a Syrian blogger in Homs, who calls himself "Big Al," says recent attempts by the international community are all too little, too late.
"Syrians are doing things on their own and no one will help them," he told CNN.
"The world watched and is still watching Syrians get slaughtered and did nothing and will continue to do nothing, so empty threats mean nothing to us," he said.
He dismissed recent reports that NATO had approved deploying Patriot missiles near the Turkey-Syrian border as an "empty threat." He also rejected the recent outcry over the threat of chemical weapons against Syrians, saying, "the only reason they're saying these threats is to pretend that they might actually do something and they won't."
"They only don't want chemical weapons to be used against Israel but I know, and everyone here knows, that if they were used against Syrians, nothing will happen and no threats will come true."
In Damascus, Leena remains optimistic about an impending rebel victory -- but she admits that the nearly two-year-long road to revolution has changed her and others risking their lives for a new Syria.
Back then, they were idealists, beginner revolutionaries.
"You want your freedom, democracy, better healthcare, work, education," she said. "We wanted dignity."
She loved her life before, but she is going to love it even more when the rebels win.
Because they will win, she insists. Soon.
"Haven't we shown that?" she asked. "Doesn't the world understand that by now?"