Yes, "thousands" of Haredi have signed up. That's not even a drop in the bucket. To take a city like Gaza City alone, you need hundreds of thousands of experienced frontline soldiers who know MOUT combat. The IDF do not have these people, so these guys can sign up, just don't expect them to walk out of Gaza City after going in. The Russians literally levelled Grozny and it still became a meatgrinder for them, and the IDF are no Russian Army.
The guy who oversaw the Battle of Fallujah left for Israel a week ago and went back to the US after a couple of days with the leaving message of "you're on your own, Israel". That's how out of their depth the IDF is.
AS for dismantling the state, it's not impossible that civil war happens or simple outside forces bring about a collapse in the state's ability to function. All those mobilised people are now not doing the jobs they were doing in the tech sector or services or hospitality etc. No one is going to visit a warzone, and others will sanction the nation for what it's currently prosecuting.
Hezbollah are still on the sidelines. In 2014, they rocked the IDF by themselves, and they've only increased their capabilities. It's just a matter of when Nasrallah pulls the trigger or not. You now have the Houthis actively targeting Israel (the US said not to, after shooting down one of their ballistic missiles, so the Yemenis sent several more to make a point).
The Iron Dome has only so many interceptors, and they cost upwards of $50k each to take out $300 rockets by Hamas. It's only a matter of time before more places are given open and unprotected airspace as they have their AD reserves depleted, much as Russia did to Ukraine.
Does that then lead to Bibi negotiating a ceasefire? Who knows? Either way, there is no off ramp here. They've already crossed the Rubicon, so to speak, and I think this ends any naïve ideas of a negotiated settlement. It's Palestinians vs. the Israeli state, and I do not see how they come out of this better.
They either genocide each and every Palestinian, which will more than likely lead to the Arab nations waking the fuck up and taking action. Or they call an arbitrary truce at some point, which only leads to Hamas and everyone else seeing that the IDF is utterly toothless now and has to rely on US carrier strike groups in the Med to deter anyone else. That is NOT a good place to be in for the nation.