Syria mulling plan to cede Shaba Farms to Lebabon

To do so they will have to sign a new border agreement.

So what will Israel do when Syria does this? If Israel turns around and vacates the portion they are on, Hizbullah will be in a tough spot.
Hizbullah (grossly false) claims of resistance to Israeli occupation, while illegitmate right now, would be deflated if:
Syria gave the land to Lebanon
Israel left.

But what if Hizbullah has been really claiming they are resisting Israeli occupation of SYRIAN land? Hizbullah is more of a Syrian stooge than a loyal Lebanese (illegally armed) political / military organization.