Kahane qualified his statement saying he doesnt mean right now but after the next elections when they would be coming to the table with more mandates and more power, they would be able to set the tone of the government and establish the foundational structure of the government, and then they would open it to anyone else who can live with that and want to join - no more bans on any party.

That is a big change in policy. The question is if Kahane is influential enough in his party and among the other Opposition parties to get others to agree. Besides for that, I think he is wrong - that might be the reason Gantz has not been willing to sit with Netanyahu. The others who have vetoed Netanyahu have done so for other reasons, saying they believe it is immoral to sit with someone who is under indictment. Kahane might have a harder time selling this to them than to Gantz.