That's the domino logic that got WWI started. Be careful.
Not to worry it will happen
Should Syria attack Israel, Israel will be unleashed because Obama has very little sway over Netanyahu.
IF Assad is foolish enough to launch SCUDs at Israel, his regime is finished within 2 hours. Problem is, then the so-called “Rebels’” (read Jihadists) take over.
If the Syrians launch Chemical weapons at Israel, Israel nukes Damascus and then they should nuke Tehran after that. Of course the UN will be up in arms but the major threats to the planet are gone...oh, maybe one more nuke on Moscow for good measure?