It may decide to restore the pre 1967 situation with regards to the border - in line with UN resolutions and international law.
That would cause a meltdown in some capitals (not just Tel Aviv).
Syria is due to be a key player in the end-game so this has been expected; Damascus will be a 'heap of ruins' in a coming day and we know this hasn't been fulfilled before because Damascus is said to be "the oldest continuously inhabited city in the world".