I'm not sure about that. I mean, Michael Bay is still directing Transformers 5 right? He's still the man leading the Transformers "vision" (lol) for Paramount. The studio is investing into a whole "cinematic universe" (roflmao) for the franchise now too. And this is all being built on the back of a series of film with terrible critical reception. The combined RT rating for Age of Extinction and Revenge of the Fallen is just barely above Sucker Punch's. That's how bad we're talking.
I mean, it's possible that producers at WB might actually be concerned about quality and value that over their long friendship with Snyder and his people. But that seems less likely than them ignoring reviews as long as the films are financially successful and have a happy fanbase outside of that. If the poor critical reception translates into box office poison, sure, Snyder has to go. But until then, I think business as usual makes more sense.