Polls are showing more people blame Bibbi for the failure than Gantz, which is probably why Gantz cancelled the meeting.
I think Bibbil will return the mandate early next week, he's more likely to get Lieberman/Peretz/Gantz to blink in the 21 days left before elections. Rivlin will probably not give the mandate to Gantz, although that would probably play to Bibbi's favor as Gantz wouldn't be able to hide behinds his mask of silence and it would finally become evident what a group of clowns they are
Don't see how this ends, even if the Likud loses 5 seats in the 3rd elections Bibbi can create the same impasse.