Many of the Syrian tanks would be decimated by the Israeli air force.
Destroying 10% of a tank probably puts it out of service.
This scenario will either have Isreal on the defensive fighting 3 fronts, or the politicians get out of the IDF's way and Lebanon, Syria, and the West Bank/Gaza get creamed. Scenario 2 will be were Iran comes in. If Iran comes in we will cream them but lose the Middle East oil for quite a while.