Primaries is a democratic way for members of a party to have a say with their votes for positioning theyre members on the parties list. No primaries makes members obsolete and leaves the head of the party to dictate on his own whims who is where on the party list, as the case with Avigdor Lieberman. We in Likud do not want this.
However the current system where voters have to vote for 12 spots, any more or less renders their vote invalid, corrupts the voting process. For this is the way deals are done. That system needs to change where only 1 vote may be cast by members for their person of choice. After the count more votes go higher on the lst, less further down till say 50 spots. Number 1 spot is reserved for the leader of the party, who can be contested only in a separate ballot with only challengers to the leader are to be voted on. usually this is not more then 2 or 3 names where 40% of the vote is required otherwise a face off between 2 at the next vote.
The reason why Begin and Meridor were voted out is because in the end they are accountable to its party members and they have been found wanting in their behaviour, actions, policies and desirability by members to be in a realistic spot for a seat in the Knesset. This is democracy and must not be done away with. If only a party leader decides whos in and whos out its a 'I scratch your back if you scratch mine' and that is open to corruption.