No Rodha, WE can't unequivocally say that, you may believe it, but many (me included) don't.
I have said before that I don't hold Rennie solely, or even principally, responsible for the Wallabies poor performances, given Deans, McKenzie and Cheika also couldn't get them to perform. While it is popular among many here to particularly trash Cheika as a coach, his record both before and after the Wallabies would suggest he is one of the better coaches on the world stage.
Where we really disagree is the suggestion that the Wallabies are on an upward trajectory, there really is no evidence to support that. Beat the Springboks? We have at least once most years. Nearly beat the AB's? Most years we have beaten them once. I could go on, but the debacles against Argentina and Italy certainly don't support any suggestion of an upward trajectory.
And for what it's worth, I would NOT have sacked Rennie prior to the WC to lock in Jones. Let's not forget, when Jones took over the Wallabies we held the Tri-Nations championship, the World Cup, the Bledisloe Cup, the Mandella Trophy and the Cook Cup, by the time he was sacked (yes, he's been sacked from both tier 1 teams he's coached) we had lost the lot. He then moved on to take the Reds to their only ever last place in Super rugby.
So while there is certainly a question mark over Rennie, I don't see Jones as the answer to that question.
I most sincerely hope I'm wrong.