I believe that the answer is very simple. The mainstream leaders on the right wing have never offered a credible alternative. The right wing was against Oslo is against disengagement now, but in fact has never offered an alternative except for the status quo. Sharon, Netanyahu, Begin, Uzi Landau, Effi Eitam, etc. have never explained how they will deal the millions of Palestinians living in Yesha. As the saying goes you can't beat someone with no one. The majority of people are not willing to give back he Golan even though we have much less of a historical connection to it. The reason for this is because the status quo is perfectly fine. Why should we give it to Syria? However, the situation in Yesha has reached a point where the majority of people have realized that the status is not a solution and can't go on. And therefore they are willing to give any plan a chance.
Meir Kahane was one of the few who had a plan and before he was banned the polls had him winning a lot of seats, because he offered a solution, he didn't just say no.
The problem is that after almost 40 years of mismanaging things I don't know if anyone can come up with a workable plan.