The position of support for creating a famine (or not giving a shit to stop it) seems to have wider support than just Bibi. This guy's move puts in focus that creating a famine is a war crime, and he's forcing the Israelis players to face that and state their support or lack thereof clearly. Getting rid of Bibi alone might not increase the aid in Gaza. If the other party leaders aren't willing to throw Bibi and Gallant under the bus for this and/or shift gears on aid, then perhaps the Israeli political class is too far gone and the world should increase the pressure till someone gets it and starts telling the Israeli public that what's happening is wrong and is extremely counterproductive for Israel as whole.
Also, some polling shows Bibi's coalition being neck and neck with the alternative so the narrative that Bibi is certain to be ejected by Israel's democracy isn't so solid.