If they were to unconditionally surrender like Japan and Germany did, perhaps they would fare as well as those places do today.
No way. Germany and Japan are doing well today because the US wanted them to do well so they can be part of their bloc against the Soviet Union. Israel doesn't want Palestinians to do well; it wants to erase them from the map. That's what wanting to "settle" Palestine means.
Do you want to see what happens when Palestinians unconditionally surrender? Look at the West Bank. There's barely any resistance there, even after it intensified in the last few years. And the result? They're the victims of a slow-burn genocide.