On the face of it, it's perfectly legal and legitimate for a company like DirecTV to charge what they wish for whatever products/services they offer. This would be akin to Apple selling the iPhone SE (of a particular memory level) for $499 today, but then changing that price downwards by $100 in six months.
In reality, it is true that DirecTV has changed its pricing structure. It's also true that DirecTV has either mentioned (or it was rumored here somewhere) that the HD fee may eventually go away, given that it's similarly been said that DirecTV might be moving to all HD by something like 2018 or 2019.
The only time that I'm aware of that you could go "class-action" against a company is (1) having not signed an arbitration clause (which almost everyone would have had to explicitly opt out of within so many days/months of signing up for service -- at least that's how I've seen some companies execute their EULA) and/or (2) otherwise reasonably caused you to enter into contract without disclosing said fees/prices.
Question: If DirecTV is being that explicit with timing as to when accounts were created, are you saying that DirecTV is willing to go against these tiers as opposed to simply giving credits on one's account?
I hate to repeat myself again about UVerseTV for rain/snow backup but if they did implement that I wonder how that would figure into the Advanced Receiver Fee and also if that rumored hybrid gateway goes headless?