Hmm... For a more realistic answer not necessarily. This isn't the first time they invaded Lebanon. I'm admittedly not aware of why they left the first time, but from what I know at least in the short term they're mostly content with the territory they currently control. Of course "currently control" including Gaza, the West Bank and the Golan heights; ethnically cleansing those was always the plan. Also when Egypt inevitably collapses as a state I could see them trying to go for Sinai.