> A unilateral course, then

No, why?

The problem I see: Even if Lebanon did that, there is still no guarantee that Israel would retreat from the areas in the south they occupied. Or even just that they'd stop with the airstrikes (they didn't stop during the previous ceasefire).

The political climate inside Israel seems to become more fundamentalist and belligerent, not less.

So there has to be an outside force that applies pressure to Israel. The only state able to do that is the US - but the US don't seem to be willing to do it.

Same with the Palestinians. Disarming Hezbollah would - very conveniently - remove one of the few remaining protective forces the Palestinians still have. So what would remain then?