Alternate Empires. Alternate Heroes. Alternate Wars. Alternate Americas. Why not Alternate Romances? Alternate Democracies? Alternate Saints? Alternate Friendships? It's not like such stories would have any less potential for gripping human drama - or even potboiler entertainment of the sort offered here.
I'm not at all criticizing these books or the writers who contributed to them; there's value in exploring these themes. But I find it fascinating how popular culture reflects and directs what we believe about the world around us. For a series based on the concept of alternate history, it's interesting that their collective subtext is one of historical and cultural inevitability.