Midgam conducted a poll of 609 people who watched the debate with a margin of error of 4% that was taken out for Channel 2 right after the debate ended.
Who do you think won The Debate?
31% No one, 25% Naftali Bennett, 10% Moshe Kahlon, 10% Yair Lapid, 8% Avigdor Liberman, 5% Aryeh Deri, 5% Iman Udah, 3% Zahava Gal-On, 2% Eli Yishai, 2% Refused to answer
Who do you think lost The Debate?
19% No one, 15% Zahava Gal-On, 14% Aryeh Deri, 14% Yair Lapid, 10% Avigdor Liberman, 9% Eli Yishai, 7% Iman Udah, 5% Naftali Bennett, 3% Moshe Kahlon, 3% Refused to answer
Did Netanyahu and Herzog make a mistake by not participating in the debate?
57% Yes, 33% No, 10% Don’t know
Jeremy's Knesset Insider 
One would hope that these numbers would translate (in the following weeks) into (much!) higher poll numbers for BY.
How much with BiBi and Buji be punished for their lame no-show?
So Basically Yishai is smack in the middle. I don’t think this debate will have a big effect on the election.