Finally, a workable solution.
Assad gives up his chemical weapons and signs the treaty. Ok, WMD threat gone, no need for the US to freak.
The civil war isn’t most other parties’ business and can’t be fixed from the outside anyway, so you try not to blow up your neighbors and we’ll try to stay out.
Obama looks like The Man for scoring a diplomatic victory. Putin and Ban Ki Moon look indispensable. The world does not become less stable. Possibly, Assad can make a friend now that he’s shedding his rogue status.
Win-win-win.