I kinda see where you're coming from with this. With games still to play, and at times an outside chance at 4th (which must have been the club's primary target for him) he's repeatedly been publicly stating that the players aren't good enough (mainly focusing on effort/fitness/tactically/professionalism).
Our players will really hate that, but they've absolutely no right to complain. Ole was the polar opposite and took bullets for them week in week out to protect them from criticism, but that wasn't enough for them either and they badly let him down too.
They definitely don't respond to the stick and eventually get bored of the carrot, so it's right that they have to go. Sadly for us there were so many games left to play and the chance of top 4, which makes it worse having to watch such a prolonged run of games of a team full of passionless players.
I do suspect RR is completely out of his depth here, and a lot of his public honesty is to deflect from his own inability to get any sort of run out of this team. It's more than likely hurting us this season, but laying bare the problem players who's dedication changes day to day.
That said, EtH may well be giving a number of them a fresh chance when he arrives, a clean slate, and so tanking this season to protect RR's reputation (if that's the case) might not achieve anything particularly positive this season or going forward.