Gotta say I'm stunned that HBO can't figure this shyt out. Right now their only premier show is Game Of Thrones, and that's moreso a ratings monster than a truly great show; it doesn't compare to The Wire, The Sopranos, etc. A lot of the great showrunners are doing stuff on Netflix and similar streaming mediums while HBO starves for talent.
They seem to have a couple solid comedies in Veep and Silicone Valley but they need a premier tier-1 show that makes people give a fukk about what HBO as a brand used to mean: high quality drama. Boardwalk Empire didn't really do this. True Detective S1 did it but it was an anthology and the second season fell off a cliff. So I'm not sure what they do next. I know David Simon has two shows coming to HBO and while they'll be dope, I doubt they'll be the hit shows HBO needs.
IMO they need some type of crime drama that transcends the medium again, like Sopranos/Wire. And preferably something that isn't played out.