With 3 "right wing" parties, Bayit, Otzma and now Yachad, it could split the right wing vote enough so that Herzog & Ho Livni waltz on through to the premiership even if they get only 15% of the vote, with the threshold having been recently raised from 2 to 3.5%!
Eidelberg holds that common sense dictates a 6% threshold, that would compel the right to form one large party.