Not the way it works or ever has. First, AEP is the Top250 and always has been. It then adds the four premiums not locals. And when they changed you to the Top250 you should have stayed. I know exactly why they did it, they were giving you HBO for free, for 3 months, and the way they do it is to change it to the Top250, they would have switched you back at the end of the promo. I believe that to be the case because that's the question my neighbor asked me when his was changed to the Top250 and four premiums after getting the Hopper installed.
There is as close to zero as possible a chance as there can be any package channel would be added that isn't in the Top250 and getting the four premiums. There never has been. The only thing you did get at one time was a reduction in fees which has long been gone.
And your logic makes no sense to me. If as you say they were to ever add channels to the AEP and not be available in the Top250 or part of the Premiums, what exactly would there be to "pitch a bitch" about? If you have AEP at that point, you will have the channels. If you have the Top250 and want those channels you would get AEP. And anything added to the Top250 obviously would be in AEP. You are putting way too much into the "Everything" label. Ignore it we have for years!
With all that said, I have to think there will be some change coming at some point. Either they are going to drop AEP, or include something like the sports pack or BB package, for less than getting them outside AEP. Or I suppose some reduction in a fee. (Just examples and just my thought)