I don't blame him one bit for leaving NPR, especially after the way he was treated by management.
A lot of people have been allowed to believe Edwards left NPR because he was treated shabbily and unfairly by management. Actually, if anything, it was management that was treated unfairly by Edwards.
He had his fans for sure, lots of them, but over the years with Edwards, Morning Edition had settled into a kind of predictable "same-ness". It was very slow to respond to big breaking stories. I'll never forget how terrible ME was during the 9-11 attacks on NYC. When it became clear what was going on, it took them almost a half hour to just get one of the reporters from their NY affiliate on the telephone for Q&A. Their coverage was just dreadful because they weren't used to reacting quickly to breaking news. It turned out that most of the ME staff below the level of "Editor" had almost no experience handling a fast breaking story.
This was just one of the things NPR management wanted to change. They wanted to shake things up, to pick up the pace of the show, and make the newsroom and the NPR bureaus lighter on their feet and able to handle breaking news. They also wanted to make ME a two-person show, the way All Things Considered has been for years, but that's where Edwards dug in his heels.
He refused to be part of any effort to turn ME into a two-person show, and that left management no choice but to tell him it would have two-hosts with or without him. That's when Edwards decided to retire.