The Israeli people were divided on the Judicial Reforms. Some even fearing civil war. Just a theory, Netanyahu allowing the attack ensures he stays in power longer which gives him time to take more power. War gives more powers to presidents and prime ministers.
To be honest, I don’t think the Supreme Court of Israel was ever going to vote against themselves. If I was a citizen of Israel, I wouldn’t want them to.
Here is a quote from the article posted by @FlyingSquid:
For him, vacating the government is like transferring ownership of property. Bibi is like a jealous husband, who cannot imagine his wife in the arms of another. It is an incurable disorder.
I really don’t know much about the Judicial Reform. Please correct me if I am wrong about anything.