When Iran launches missiles at Israel, they will be glad that Bibi is the Prime Minister.
And that, is where the Rubber Will Meet the Road.
Complacency kills.
Yup. And if he's not PM, they'll bust him out of jail and *make* him PM again when the rockets start to rain down. The 1973 Yom Kippur War cracked the Labor Party's long hold on power (you'll notice that they've dwindled from one of the two large parties down to an also-ran); when the next attack comes, Israel's response to that attack will probably ensure there will be no further attacks.
Gantz is a former IDF Chief of Staff and two of his top supporters are also former IDF Chiefs of Staff. No one is going to panic if Netanyahu is not there.