I wonder if they'll be brave enough to convict him

They spent 12 years and countless millions, but found no evidence of any wrong doing. Last week they forced him to resign because an indictment was imminent for a silly charge that isn't really a crime. If they had enough evidence, do you think they would suddenly want to investigate more? It is more likely that they figured he'd stay in power and they could bash him for obstructing justice. He outmaneuvered them by calling their bluff and resigning. If for nothing else, the AG should resign for the appearance that he is intervening in the elections, making a mockery of the Israeli "justice system".

Bravery has nothing whatsoever to do with an indictment. Evidence is of course a prerequisite.