If you can find a genocide in post WW2 history that didn’t result in the failure of the perpetrators state, that only refutes the absolute strongest version of my claim. However that doesn’t refute my general claim that Genocidal states do in fact tend to dissolve over the following decades, and that history has examples of apartheid states—even heavily armed ones—dissolving into a single state democracy of all its people.
Looking at history the pattern is pretty clear, even though it is not absolute (nothing in history is).
Assuming it is genocidal. You classic genocide is rounding up people and killing them all, eg the Nazis on the jews. Israel's approach has been to let the Gazans get on with things with their population growing from 1.1m in 2000 to 2.04m in 2024 then being attacked and and killing 0.04m fighting back to get their hostages. If they are doing a genocide I'm not sure they are doing it right.
However if the goal is to create conditions favorable to what they coldly refer to as "voluntary population transfer", i.e. ethnic cleansing very much in the classical definition -- they they're doing a masterful job indeed:
Looking at history the pattern is pretty clear, even though it is not absolute (nothing in history is).