It's going to fall apart and fail. A few likely scenarios.
1.Assad fails the 1 week deadline.
2.In the middle of the handover Hezbollah acquires large amounts of Syria's CW and Israel targets them,ending the agreement.
3.Try again-US backed Free Syrian Army (which is against the agreement) once again uses chemical weapons on their own people and this time Obama moves against Assad immediately as this was his plan the first time but he got cold feet.
4.Iran and her proxy armies Hamas and Hezbollah behind major terrorist attack inside Israel and Israel has to respond,bringing an end to carrying out agreement
5.Israel finally decides to target Iran's nuclear sites and the region is plunged into major war.
6.Obama /Kerry decide Assad has crossed their red line again and nullify the agreement.
7.Obama's FSA terrorists kill UN CW teams and makes it look like Assad did it.
8.What can go wrong will go wrong because the devil is in the details and it's the Middle East and everyone including the EU,US,UN wants to get rid of Israel just as much as Islam an Iran does.
Israel,Keep your gas masks close by and don't let your guard down for a minute.
I predict that US diplomacy underway with Russia in Geneva over Syria will fail and the proud fool Obama will not be able to resist,he will start WW III.
It's as simple as 2+2 equals 4, unless you are a
Reprobate fist's shaking in the face of God,Sodom and Gomorrah shall have the fire and brimstone it so desires and then the time of tribulation begins.