Israel, like the U.S., conducts war against terrorist organizations (like Hezbollah) far differently than she fights nations with traditional militaries. First world nations with first class militaries find it far easier to take on the latter. Hezbollah fights in the shadows and hides behind women and children. It's very difficult to look good against that type of enemy (as we Americans have learned all too well these past few years). Taking on Syria or any nation with a traditional military would be child's play by comparison. Israel would bring them to their knees in short order.
An attack by Syria on Israel should be met by a massive bombardment by the IDF and US Forces. It should lead to a total collapse of Assad and his dictatorship as quickly as possible putting our strategic position as the first priority. The destruction of Syria as a dictatorship will benefit all civilized people.