With Gantz now gone, the chances of war between Hezbullah and Israel have increased. Gantz was one of the few dissenting voices calling for de-escalation in the North, because the IDF was too bogged down in Gaza. Gantz rightly predicted that Israel would get stuck in Gaza and the war would go on for years, which is why he wanted to quickly withdraw and announce a Palestinian/international puppet administration in Gaza to replace Hamas. In other words he didn't want the idf distracted by opening another front in the North, while they fought an insurgency from Hamas/allies, and set up a puppet regime to eventually take over policing duties like the PA/PLO does in the West Bank.
With him gone, the far right can now dictate terms and push for war in the North.
Netanyahu is trying to avoid both jail for corruption and losing his job. He's likely going to succumb to the far right.