Well we'll find out soon enough. The US will undoubtedly strike any day now, and it's reasonable to expect that they will cause sufficient damage to allow the rebels to take over.
After all, they aren't just striking at Assad's forces, they are also providing weapons (and who knows what else) to the rebels. For all we know there are covert CIA ops going on over there already. No doubt they're feeding the rebels info and giving tactical advice.
we have been training them too
http://rt.com/news/americans-train-syrian-rebels-073/
http://www.theguardian.com/world/2013/mar/08/west-training-syrian-rebels-jordan
we probably sent them "aid" as well