No, I think you represented something that couldn't be backed up and I noted it is all. Time, and the outcome of the DoJ appeal will determine if this was a wise acquisition by AT&T. I believe it will prove not to be. However, going back to the topic of the OP, if original programming dollars are shifted from TBS/TNT to HBO, this could have an impact on the perceived value of these networks. There are many outlets carrying reruns now. It makes it easy to move these stations to a higher, and less subscribed tier, especially from cable outlets that compete with AT&T. I don't see the NBC channels owned by Comcast as being similarly disposable by AT&T. For one, they get higher ratings than their AT&T owned counterparts and some are covered by 'must carry' rules.
The point made by BigA, and substantiated by the public financial data, is that the Turner division is more profitable.
Now that the AT&T operating model is to combine the divisions under one management team, there may, naturally be a reassessment of the focus and resources of individual channels. But overall, the Turner group, where more profits historically came from, is not going to be "gutted" to enhance HBO to the point of hurting those revenue streams.