Well, it always hurts when a lead designer leaves, but I don't think it's a death knell or anything like that for 5E. I was not really impressed with some of Monte's early musings on 5E after he had signed on to be a part of the team - at least a few of them sounded like he was stuck in 3E and had forgotten that 4E existed, meaning his idea took a 3E idea and proposed a solution that sounded similar to 4E.
And, I don't favor any one edition over another. Each edition has its good and its bad - 4E is great in terms of DM prep time, while 3.5E was great in allowing players a lot of flexibility.
And, I don't favor any one edition over another. Each edition has its good and its bad - 4E is great in terms of DM prep time, while 3.5E was great in allowing players a lot of flexibility.