said by Os:Considering that CBS and Viacom are still controlled by the same Redstone family that controlled them when they were together I doubt the split had much to do with Epix. It probably had more to do with Showtime's inability to renew contracts with Lionsgate and MGM who are Epix joint venture co-owners with Viacom.
I actually think the one who could shake things up might not be HBO, but Epix. It's got the backing of Viacom, and doesn't receive the advantages of carriage. Comcast, TWC and DirecTV won't touch it. It's also got a large online component, and I believe some content sharing still with Netflix.
Should it exist? Probably not. It only came to be due to the CBS/Viacom split (Showtime going to CBS). But to expect the rascal in the room to be the industry standard might be too optimistic.