Yeah, to be honest, if it's a choice between changing things to tell a good story with a good character now or adhering slavishly to 70-odd years of history and backstory, then that backstory can be pruned to hell as far as I'm concerned.

Plus, I'd be utterly amazed if the point of this story arc wasn't Diana finding a way to restore Hippolyta and the other Amazons -- the whole thing has "redemption and acceptance of the past" story-arc written all over it.