Can't buy that. It's not a credible analysis. It's possible to imagine a war with Syria at some point in the future, I suppose, but American troops in two Arab capitals at once, Baghdad and Damascus, would be stupidly excessive.
Besides Syria would NEVER leave Lebanon on their own accord, even if they were credibly threatened by invasion from Iraq. Syria essentially has no economy. Lebanon IS their economy. It provides the perks, payoffs, sinecures, and etc which are essential to reward and retain the supporters of any authoritarian government.
The withdrawal from Lebanon presents an existential threat to the Syrian government nearly as great in the long run as a war with Iraq and the Americans, and gives them fewer (not more) options in dealing with such a war if it does occur. After all the fielding of a few divisions more or less won't make any difference in facing the American military; but financial resources, the ability to stir up trouble elsewhere in the region, and the ready availability of proxy warriors like Hezbollah, might.
We're not at war with Syria... yet. And actually I think the plan is simply to kill their leadership, rather than to go to war. Assad must know he has a bright red bullseye on his forehead.
The Syrian "diplomatic walkout" over "insulting allegations" came only two weeks after Operation Matador over by the Syrian border. 285 terrorists were killed (many Syrian and Saudi mercenaries), and several hundred more were captured. I have no doubt they spilled the beans about Syrian government complicity in the horrid terrorism against the innocent citizens of Iraq, not to mention American soldiers. Assad is now on the hot seat, big time.
I predicted months ago (right after the elections) that the first major activity of the new Iraqi government would be a brutal and thorough assault against the psycho Islamist mercenaries in Iraq, most of whom are from Syria and Saudi.
It looks like that's about to happen.
Expect hysterical pronouncements from NGOs and the MSM. It's going to be bloody.... and successful.
Assad must be terrified and looking for his own spider hole.