Take your pick:
1. turn Syria into glass parking lot;
2. keep fighting Syria and Iran-sponsored and equipped proxy armies;
3. peace with Syria and hope they decide to join the civilized world;
4. if 3. is seriously attempted and fails, see #1.
That is basically it. We are seeing the Bush Doctine play out and it will accelerate as his term nears and end. It could end like Clinton's term, with total disaster for the people of the middle east. But what we see are the moves setting up the ultimate moves.
Iraq is liberated with Iran making a mess of it. Syria is in bed with Iran but Saudi and Egypt and others are full-court pressing Syria to come back into the fold. Lebanon has been (somewhat) forced to face its problems. Ultimately the idea here is to pluck Syria from Iran's sphere, isolate Iran and eventually topple the regime. If Lebanon and Syria can be split from Iran's sphere it becomest that much easier.