No product I know of where a lead designer left mid development has become good. That will likely happen with 5E, too.
The important thing is not that Monte left, but the reason why he left. Its pretty obvious that WotC were marginalizing him during development and apparently developed so many things which are against Montes ideas of a good game that he was fed up and left.
So, for everyone who thinks that 5E will bring back some things from 3E, no it won't. Whatever Monte wants to see in a game, it won't be in 5E.
The important thing is not that Monte left, but the reason why he left. Its pretty obvious that WotC were marginalizing him during development and apparently developed so many things which are against Montes ideas of a good game that he was fed up and left.
So, for everyone who thinks that 5E will bring back some things from 3E, no it won't. Whatever Monte wants to see in a game, it won't be in 5E.