With respect, my read on Berube so far is quite different to this. I'd be very surprised if he wants to keep Marner and personally hope he doesn't. Berube has this week repeatedly said that his style of of hockey is to play 'north', to play a 'heavy' game where his players are hard on the puck and to play in straight lines. He stresses effort on every shift and aggressive forechecking. None of that sounds particularly suited to Marner. We don't have to take Berube's recent words for it, of course; the evidence is in the way his teams have played. I just don't see Marner adapting to that style, or even wanting to adapt, quite frankly. I'm fairly sure Berube hasn't been hired to adapt his style to fit our existing players, either.
I suspect his naming of Marner as someone he's spoken to is likely a reflection of his awareness of the current climate around the player. I also suspect when he was in discussions about taking the job, he will have gotten a firm sense from Treliving about his plans for Marner, whatever they may be. Along with the plans for a goalie and beefing up the defence, etc.
In terms of this tire fire you mention, while the vitriol around here is obviously uglier than you see in the media, I'm pretty confident in saying that, in general, most well-known pundits would say that Marner's days here are likely coming to an end. Many of the ones I pay attention to have been going on the record to say they think he needs to go. I agree.
Lastly, having said all that, except when it comes to Marner, I find myself agreeing with your posts for the most part. I can also understand why you might feel some of the more hyperbolic anti-Marner posts need a bit of push back. I partially agree with your statement that a lot of this is about the contract and not the player. It started there for me five years ago, certainly, with the 10.893 travesty. But it's not just the overpay -- I also think he's far, far too soft, particularly in the playoffs and therefore think that it's time for a change.