It appears from this article that the United States will not be sending a new ambassador to Syria. The author provides several good reasons why.
No matter what the Syrian government is offered – normal relations, a looser sanctions regime, trade agreements – it has never rolled back support for international terrorist organizations. Syria refuses to hold peace talks with Israel or close down the local branches of Hamas and Islamic Jihad. Assad won’t stop obstructing the formation of a new Lebanese government nor will he shut down his terrorist pipeline into Iraq.
“The impediment to real change in the Syrian regimes behavior in a manner that would satisfy American decision-makers is structural and systemic,” wrote Tony Badran in Now Lebanon. “Syria cannot abandon its support for violence and subversion, or its alliance with Iran, because those are the only tools allowing it to bolster its relevance above its political weight.”