The agreement shattered Gantz's Blue and White party, with many of his legislators refusing to enter the government, and has widely discredited the ex-general.
Netanyahu is reportedly preparing for a winter election - the fourth in two years - both to cash in on his opponents' disarray and to avoid honouring a rotation agreement in which Gantz is due to replace him late next year.
According to the Israeli media, Netanyahu may find a pretext for forcing new elections by further delaying approval of the national budget, despite Israel facing its worst financial crisis in decades.
And, of course, overshadowing all this is the matter of the corruption charges against Netanyahu. Not only is he the first sitting prime minister in Israel to stand trial, but he has been using his role and the pandemic to his advantage, including by delaying court hearings.
In a time of profound crisis and uncertainty, many Israelis are wondering which policies are being pursued for the national good and which for Netanyahu's personal benefit.
The government's months-long focus on the annexation of swaths of Palestinian territory in the West Bank has looked like pandering to his settler constituency, creating a dangerous distraction from dealing with the pandemic.
Similarly, a one-off handout this week to every Israeli - over the strenuous objections of finance officials - looks suspiciously like an electoral bribe. As a result, Netanyahu is facing a rapid decline in support. A recent survey shows trust in him has fallen by half - from 57 per cent in March and April, when the Covid-19 pandemic began, to 29 per cent today.
Many Israelis increasingly see Netanyahu less as a father figure and more as a parasite draining resources from the body politic. Capturing the popular mood is a new art work called the "Last Supper" that was covertly installed in central Tel Aviv. It shows Netanyahu alone, gorging on a vast banquet by stuffing his hand into an enormous cake decorated with the Israeli flag.
In another move designed to highlight Netanyahu's corrupt politics, better-off Israelis have been publicly organising to donate this week's state handout to those in need.
Netanyahu's repeated incitement against the protesters - disparaging them as "leftists" and "anarchists", and suggesting they are spreading disease - appears to have backfired. It has only rallied more people to the street.
But the incitement and Netanyahu's claims that he is the true victim - and that in the current climate he faces assassination - have been interpreted as a call to arms by some on the right. Last week five protesters were injured when his loyalists used clubs and broken bottles on them, with police appearing to turn a blind eye. Further attacks were reported at the weekend. Protest organisers said they had begun arranging defence units to protect demonstrators.
Ohana, the public security minister, has called for a ban on the protests and urged a heavy hand from the police. He has delayed appointing a new police chief - a move seen as incentivising local commanders to crack down on the protests to win favour. Large numbers of protesters have been forcefully arrested, with reports that police have questioned some on their political views.
Observers have wondered whether the protests can transcend party political tribalism and develop into a grassroots movement demanding real change. That might widen their appeal to even more disadvantaged groups, not least the one fifth of Israel's citizens who belong to its Palestinian minority.
But it would also require more of the protesters to start drawing a direct connection between Netanyahu's personal abuses of office and the wider, systemic corruption of Israeli politics, with the occupation its beating heart.
That may yet prove a tall order, especially when Israel faces no significant external pressure for change, either from the US or from Europe.
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