One must understand the reality of the Israeli politics. There are Israelis who already doubt the ability of Sharon to function inside this coalition. Israelis may go to general election pretty soon. The law of direct election was eliminated. When the external reality, the Palestinian war will be relaxed, the party leaders might challenge Sharon or try to blackmail him.
People have a short memory.
They will forget the unique victory of Sharon and will argue that he is too old to run the country. Also, the popular leaders of the Labor party such as Abraham Burg and Haim Raman were left behind. They are not ministers in the cabinet. They tend to cooperate with the Left. Sharon's government is a 'hawkish' one.