Sucks you feel that way, however the Guardian "ending" was not supposed to be a bookend ending, the book got pulled. However, that's neither here nor there, if they actually followed through with something interesting when they appointed him leader of the green lantern corps, i feel something akin to him operating closer to Guardian level problems would've been the logical next step. It's a promotion, a vehicle of developement; remember when Kyle was a Guardian? The problem with the Green Lantern corp is that they all serve the same purpose, and the lantern mythos is most interesting when it's approached from different angles. I don't see why we need 6+ lanterns doing the same thing. Why not follow up on existing ideas out there for this character? It's not like characters don't get promotions and status developments all the time. I lack the cynicism to see why John shouldn't get the same shot, and I think following up on existing ideas for the character like him being the leader of the Lanterns, like his relationship to the Guardians, like him BEING a Guardian at one point, would be the most compelling way. It's all in the execution.