I don't think anyone was "blaming" Ron for the Dreamfinder banishment. What we are saying is that as a character Dreamfinder was an intimate, one park only character, people recognized the voice and the mannerisms that Ron conveyed. Much like, no matter how hard they tried, there is only one Music Man and only one James Bond. Everyone else was just an actor. That put a lot of pressure on Ron, but nothing compared to the problems that it presented for Disney management. So when the opportunity came to make a change, I'd bet that the first thing that came to mind was...get rid of Dreamfinder and, at the time, Figment.
Ron was a victim of the fact that he played the part too well.