Many of those sympathisers that you talk about are Sunni-based terrorist groups such as Al Qaeda. Those who are happy to see Iranian allies crushed (I am one of them) should not automatically think that what follows will be an improvement. I would humbly suggest you restrain your joy not only till Assad has fallen but until you see what follows.
Syrian group says Nusra abducts its leader, in blow to U.S. plan (Reuters)
from the article: Russia: Assad 'losing control'; 16 killed in car bomb near Damascus