They backed themselves into a corner when they made Superiority Dice to be the sole special thing about the Battlemaster. All fighters should have got Superiority Dice, and then they bothered making the Battlemaster the master of using Superority Dice.
In contrast, I think they backed themselves into a corner when they created one subclass with
all the maneuvers, and worse, one where every maneuver has the same cost.
Had they included a "specialized Battlemaster" with a much more focused set of maneuvers, or at least one with "tiered" maneuvers (where low-level characters can only select from a limited set, and others become available only at high levels) there would still be design space for more subclasses associated with superiority dice.
As it is, superiority dice is essentially dead as a mechanism valuable in creating new subclasses.
The Battlemaster could theoretically be errataed to have restrictions that are meant nerf flexibility (but not necessarily power).
However, it seems clear no such redesign errata is forthcoming, so all you could hope for is a new set of superiority dice subclasses, say a trio, where each one steals one third of the Battlemaster's schtick and adds a little something unique to it.
Then you're faced with the choice: do you go for the generic Battlemaster, or the new trio of subclasses?