The main reason Cheika won't be sacked as RA can't afford to pay him out.
Almost as importantly it's the wrong time to be replacing a coach. People should remember that this is almost 4 years to the day that Link's reign ended. Cheika was then put into the role before he was ready (I was one of the few to point this out at the time). Should have been Eddie Jones, but that's history now.
Thirdly, there is a limited group of coaches who could possibly add anything to the current Wallaby team in the next 12 months, so throwing an untried at international level coach in at this point is worse IMO than the status quo. Only E. Jones. W. Gatland, G. Henry or J. White would be worth the effort - and after paying out Cheika RA wouldn't have enough to pay them for a fortnight. (assuming that they were even available or interested)
As for Rod Kafer, if he's the answer then someone is asking the wrong question. A professional pundit, advisor, assistant and commentator who has never had success when he's been head coach. He's part of the problem and most definitely not part of any successful solution.